How to Recognize Search Engine Spam
Spam is any attempt to deceive the search engines into ranking a Web page when it does not deserve to be ranked. Types of spam include hidden text and links, doorway pages, deceptive redirection, cloaking, unrelated keywords, keyword stuffing, and link farms.
Hidden text/links
One of the more obvious ways to spam a Web site is inserting hidden text and links in the content of the Web page (content of a Web site being anything that the user can see). Examples of using hidden text and links are
White text/links on a white background: Putting white text and links on a white background renders it invisible to the user unless the text is highlighted by right-clicking on the mouse. Spammers can then insert keywords or hyperlinks that the spiders read and count as relevant.
Text, links, or content that is hidden by covering with a layer so it is not visible: This is a trick that people use with CSS. They hide spiderable content under the page that can’t be seen with the naked eye or by highlighting the page.
Positioning content off the page's view with CSS: Another programming trick spammers use.
Links that are not clickable by the user: Creating a link that only has a single one by one pixel as its anchor or using the period on a sentence or no anchor at all. There's nothing for a user to click on but the engine can still follow the link.

An example of white text on a white background.
Doorway pages: Doorway pages are used to spam the search engine index by cramming it full of relevant keywords and phrases so that it appears high on the results page for a particular keyword, but when the user clicks on it, they are automatically redirected to another site or page within the same site that doesn't rank on its own.
Deceptive redirection: Deceptive redirection is a type of coded command that redirects the user to a different location than what was expected via the link that was clicked upon. Spammers create shadow page/domains that have content that ranks for a particular search query (the words or phrase you type into the search box), yet when you attempt to access the content on the domain you are then redirected to an often shady site that is commonly for porn, gambling, or drugs, that has nothing to do with your original query.
Cloaking: Another nefarious form of spam is a method called cloaking. Cloaking is a technique in which the content presented to the search engine spider is different than that presented to the users' browser, meaning that the spiders see one page, while you see something entirely different.
Spammers can do this by delivering content based on the IP addresses or the User-Agent HTTP header (information describing whether you’re a person or a search engine robot) of the user requesting the page. When a user is identified as a search engine spider, a server-side script delivers a different version of the Web page, one that contains content different than the visible page. The purpose of cloaking is to deceive search engines so they display the page when it would not otherwise be displayed.
Unrelated keywords: Unrelated keywords are a form of spam that involves using a keyword that is not related to the image, video, or other content that it is supposed to be describing in the hopes of driving up traffic.
Examples include putting unrelated keywords into the Alt attribute text of an image, placing them in the metadata of a video, or in the Meta tags of a page, and any time an unrelated keyword is used. Not only is it useless, but it also gets your site pulled if you try it.
Keyword stuffing: Keyword stuffing occurs when people overuse keywords on a page in the hopes of making the page seem more relevant for a term through a higher keyword frequency or density. Keyword stuffing can happen in the metadata, Alt attribute text, and within the content of the page itself.
Basically, going to your Alt attribute text and typing porsche porsche porsche porsche over and over again is not going to increase your ranking, and the page will likely be yanked due to spam.
Link farms: A link farm is any group of Web sites that hyperlink (a link to another part of the Web site) to all the other sites in the group. Most link farms are created through automated programs and services. Search engines have combated link farms by identifying specific attributes that link farms use and filtering them from the index and search results, including removing entire domains to keep them from influencing the results page.
Using invisible or hidden text is a surefire way to get your site banned so it no longer shows up in the engines. The reasoning behind this is that you would want all of your content visible to the user, and any hidden text is being used for nefarious purposes.

SEO Glossary
404 error logs
The server record of every time a page could not be displayed on a Web site.

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A/B testing
A comparison between the old version of a Web site (A) and the new version (B) to see which one performs better.

SEO Glossary
absolute link
A link that contains the whole file path to a document, including the protocol used to get the document (e.g., http://), the server the document is found on (www.mysite.com), the directory it is located in (images), and the document name (vacation.jpg).

SEO Glossary
acquisition
The measure of users that a Web site attracts. Acquisition metrics come from Web analytics data and include percent of new visitors, average number of visits per visitor, and average pages viewed per visitor.

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ad group
One or more ads that target a set of grouped keywords.

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advanced search operators
Special terms that you can insert in your search engine query to find specific types of information that a general search can't provide.

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algorithm
A mathematical formula a search engine uses to establish which Web pages are the most relevant to a user’s search query. Algorithms can be fairly simple or multi-layered and complex.

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anchor text
The words that make up a hyperlink that a user clicks.

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archive
A storage area on a server where older Web content is out of the way, but still accessible.

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Astro-turfing
A term used for a fake grassroots market campaign; this derives its name from AstroTurf, which is artificial grass.

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backlink
An incoming link to a Web page from another site.

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bad neighborhood
A Web site that has been banished from a search engine index because they were caught spamming or using other sneaky methods to fool the search engines into giving them a better ranking.

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bandwidth
The rate at which data moves from one point to another over an Internet connection.

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behavioral search engine
A search engine that tries to guess what exactly a user is looking for based upon their previous search inquiries.

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blacklist; IP blacklist
A list of sites suspected of illegal acts such as child pornography, e-mail spam, or hacking.

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blended search
The integration of different content types onto a search results page, such as images, videos, news, blogs, books, maps, and so on.

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blog
Short for ‘Web log.’ An online conversation medium used to cover a wide range of subjects, including entertainment, politics, fashion, lifestyles, and technology. A blog can be anything from a personal journal to a media and corporate platform for describing new products and services.

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bounce rate
A measure of the percentage of people who leave a Web site right after entering a page on that site, usually within seconds and without visiting any other page on the site.

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branding
Establishing a company name and associating it with that business; well-known examples include Nike and Xerox.

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browser plug-in
A software application that enhances a Web browser’s existing features.

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cache
The stored version of a Web page.

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canonical site
In the case of Web sites with duplicate content, the site the Webmaster prefers visitors and search engines to access. The primary, main Web site.

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CGI
An acronym for Common Gateway Interface.

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chiclet
A Web icon or link that can be clicked to submit or vote for an article on a particular social news or bookmarking site.

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click map
A report that overlays Web pages on a site and indicates, on a per-page basis, which links visitors are clicking on to go to other pages on the site. Often, the most clicked-on links are bigger, have a richer color, or a note indicating how many clicks the link received.

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click-through rate CTR
The frequency (number of times) that an Internet ad is clicked on.

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cloaking
A technique in which the content of a Web page presented to a search engine spider is different than that presented to a user’s browser; as a result, the spiders see one page, while the user sees something entirely different.

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CMS
An acronym for Content Management System.

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concatenate
Run words together without spaces.

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Content Management System CMS
Software that helps you create, edit, and manage a Web site.

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content siloing
A technique of organizing a Web site into subject themes by linking related pages together.

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content stacking
Writing the HTML for a Web site in such a way that the page content is delivered to the search engine spiders before any scripts or navigation elements.

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content syndication
Distribution of a Web site’s content to other sites.

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conversion
An action taken by a Web site visitor that meets the sales or business goal of that site. This is also a term for site visitors who become customers.

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conversion funnel
The path that a visitor to a Web site takes to perform a desired action, most commonly a purchase.

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conversion metrics
Basic processes on a Web site that can be measured to determine whether visitors are performing desired actions, or abandoning the site.

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conversion rate
The number of visitors who actually purchase something, sign up, or take whatever action is appropriate on a Web site.

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cookie
A small text file that a Web server automatically assigns to a user's browser; cookies are used to track, authenticate, and maintain specific information about users.

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cost-per-click
The amount an advertiser pays each time their Web ad is clicked on a search engine results page.

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country-code top level domain ccTLD
The last part of an Internet domain name; specifically, the letters that follow the final dot of any domain name. A country-code TLD is specific to a particular country, such as .ca, .cn, .uk, or .mx.

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CSS Cascading Style Sheet
A separate file that is used to control formatting of text and images on a Web site.

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day-parting
A feature that allows a Web advertiser to specify when during the day their advertising is shown on search engine results pages.

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deceptive redirection
A type of coded command that redirects a browser to a different location than what was expected via the Web link that the user clicked.

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dedicated server
A Web server that is used exclusively by one Web site, and not shared with any other sites.

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demographics
User data such as gender, age, and so on.

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direct type-in traffic
Users who type a URL directly into their Web browser’s address bar.

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directory
A list of Web sites a search engine can search through that’s typically compiled by people, rather than by computer programs.

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distribution
The placement of a keyword throughout a Web page.

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domain name
The base address of a Web site, such as mydomain.com.

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domain name registrar
A company accredited and authorized to register Internet domain names.

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doorway page
A Web page submitted to search engine spiders that has been designed to satisfy the specific algorithms for various search engines, but is not intended to be viewed by visitors. A doorway page is usually filled with text content that makes it rank high for a certain keyword.

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duplicate content
Identical or similar content that appears elsewhere on a Web site or on the Web.

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e-commerce site
Any Web site that sells a particular product or service.

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elephant word
A big word that is so laborious to type and so obscure in usage that only a very serious searcher would think of entering it in a search engine query.

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e-mail spam
Unsolicited e-mail that is sent indiscriminately to many people.

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encrypted
Converted into a form that cannot be understood except by knowing one or more secret decryption keys.

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engagement object
Any type of interactive media object on a Web site that engages the Web site visitors’ interest. Examples include images, videos, audio, games, and applications.

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error code
A message that a Web server sends to a visiting browser when something goes wrong.

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exit page
The last page a visitor is on before they leave a Web site.

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frame
An HTML technique for combining multiple documents in different sub-windows, all within a single browser window.

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geolocation
The identification of a Web page as belonging to or being relevant for a particular country.

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geotargeting
A technique used by a search engine to personalize search results to include local listings for search terms, based on a computer’s IP address. This technique is often used when a person searches for items that involve brick-and-mortar businesses or services that need to be provided locally.

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Golden Triangle
A visual heat map showing how people’s eyes scan a search results page and how long they look at a particular result before moving on.

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guided search
A Web search where the search engine makes suggestions on queries; examples include Google or Yahoo! Suggests.

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hack
Attempt to break into computer networks and bypass their security.

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hosting provider
A third-party company that leases out Web space by the month or year, similar to office space.

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.htaccess file
A control file that allows server configuration changes on a per-directory basis. The file controls that directory and all of the subdirectories contained within it. Usually, this file is placed in the root folder of a Web site.

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Hyperlink, hypertext link
A link to another part of a Web site.

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impressions
The number of times an ad appears in search results to search engine users.

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incestuous links
Links to the properties of an individual or organization, or among a group of friends' sites, where the links are then passed off as legitimate links from outside sources.

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index
The database of Web sites that a search engine pulls results from in response to search queries.

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indexing
The process of taking raw data and categorizing it, removing duplicate information, and generally organizing it all into an accessible structure (think filing cabinet versus paper pile).

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internal links
Links on a Web site going to other pages within that site.

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internal site search engine
A search engine that searches only a particular Web site.

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Internet backbone
The main hub connections of the Internet, which are primarily located in major cities around the world (Los Angeles, Denver, New York, and so on).

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Internet forum
A message board where users can log on and post about topics on a related subject.

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Internet Protocol IP address
The numeric code that identifies the logical address where a computer, server, or site resides on the Web.

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ISP
An acronym for Internet Service Provider.

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JavaScript
A scripting language used to add functionality to Web sites.

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keyword
A word relating to Web site content that search engines use to determine whether the site is relevant.

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keyword density
The measurement of the number of times a keyword or keyword phrase appears on a Web page, compared to the total number of words on the page.

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keyword phrase
A search query containing two or more words that Web page content relates to.

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keyword stuffing
Putting every word, not just relevant ones, into the content of a keyword tag; repeating keywords over and over again.

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landing page
The Web page that a visitor first goes to when clicking on an ad in a search engine.

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link bait
Content that is created for the purpose of attracting attention and links to a Web site. Link bait is an accelerated version of a link magnet.

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link equity
The perceived-expertise value of all the inbound links pointing to a Web page.

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link farm
A network of Web sites that hyperlink to all the other sites in the group. Link farms are built for the express purpose of driving up link popularity.

SEO Glossary
link magnets
Elements on a Web site that are built in such a way that people naturally want to link to them. People happen upon the site, find the link magnet, and decide that it’s relevant and worthy of a link, so they create a link to the content on that site.

SEO Glossary
link request
An e-mail or other contact with someone that asks for them to link to a Web site.

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local search engine
A search engine specializing in Web sites that are tied to a limited physical area (also known as a geotargeted area).

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Local Shared Object LSO
Similar to a cookie, an LSO is a text file that can be read only by the Web site creating it. Browsers and anti-spyware programs can't delete them, and most users don't know how.

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Long Tail
A statistical concept that says that items that are in comparatively low demand can nonetheless add up to quite large volumes.

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Long-Tail search queries
Keywords, or search queries, made up of several words or a phrase.

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markup
Formatting and other types of HTML code, such as Font tags to define the font style.

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metric
A quantitative measure of something, such as a process, rate, or amount.

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mirror
A full copy of a Web page or site.

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multi-page analyzer
A program that measures the keyword density of multiple Web pages.

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multivariate testing
Testing small changes to a Web site, such as the change of a certain font, or a button instead of an arrow. Typically, this involves testing many small changes to the same page at once instead of two totally separate pages, as in A/B testing.

SEO Glossary
negative keyword list
A list that is made up of the keywords that an advertiser does not want their ads to show up for.

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news aggregator
A software program that allows users to subscribe to and read RSS feeds.

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non-targeted content
Generic text that isn’t customized for a Web site’s various subject themes and keywords.

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null test
In A/B testing, a test that is run on two A pages (pages on which no changes have been made) in order to establish a baseline and make sure the traffic isn’t adversely affected.

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online social networking
Web sites where people can meet and interact with one another; examples include MySpace and Facebook.

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on-page factor
The HTML tags and the visible content on a Web page.

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on-page optimization
The changing of the underlying code of a Web page for the purpose of search engine optimization.

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open source
A term for a Web site that allows anyone to access and edit its content.

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open-source software application
A computer program whose source code is available for free to the public.

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organic search results
Web pages that the search engines find on their own using their spiders. These results are not paid for by advertisers.

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parameters
Automatically generated URL characters that carry information to the receiving Web page about a user.

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pathing
Reviewing the flow, page by page, that a user takes while visiting a Web site.

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pay-per-click PPC ad
Paid advertising that appears in search results, for which advertisers pay a fee every time their ad is clicked.

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persona
A profile that represents a target audience based on calculated averages of their buying processes and demographics.

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PPC
An acronym for Pay Per Click.

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printer-friendly page
A separate version of a Web page that is designed specifically for printing. A printer-friendly page contains the same content as a regular Web page, but without the heavy images and advertisements that require a lot of printer ink.

SEO Glossary
query strings
The parts of a URL that pass data to a Web page. Query strings aren’t readable because they contain symbols (such as ?, &, and +) as well as codes, session IDs, and so on.

SEO Glossary
reach
The degree to which a Web site reaches customers. Measures of reach include overall traffic volumes, number of visits, number of new visitors, ratio of new to returning visitors, and visitor geographic data. Reach metrics depend on information from various sources.

SEO Glossary
reciprocal links
An exchanging of links where two sites link to each other: site A to site B and site B to site A. This is essentially a barter and generally does not contribute much, if anything, to link equity, but it is not harmful.

SEO Glossary
redirect
An HTML command that automatically forwards incoming links to a different Web page.

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relative link
A link that references a file located in a physical directory relative to the current page or the root of all directories, so it can simply start with the page name and leave off the http:// and domain information.

SEO Glossary
response metric
An element that visitors are responding to on a Web site, such as an image, a newsletter, or an e-mail.

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response time
How fast a Web server is and how long it takes for users to load a page from that server.

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retention
A measure of how many customers remain once they come to a Web site.

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reverse DNS lookup
Looking at what Web server a user is coming from.

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ROI
An acronym for Return On Investment.

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scalability
The ability to expand Web server resources as needed.

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Scalable Inman Flash Replacement sIFR
A powerful technology that enables a Web designer to use a wide variety of fonts on their Web pages without sacrificing search-engine friendliness or accessibility.

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scraper
A person who sends a robot to a Web site to copy (or scrape) the entire site and then republish it as their own.

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search box
The text box in a search engine page where users type their search queries, or whatever it is that they’re looking for.

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search engine
A Web application designed to hunt for specific keywords and group them according to relevance.

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search query
The word or phrase that a user types into the search box of a search engine.

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search verticals
Links to specialized vertical search engines that narrow a search into a specific type of result, such as images or news. Clicking one of these links takes a user to a results page with only images or only news.

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segmentation test
Testing the variables in incoming Web traffic, such as finding out the demographics of the incoming traffic by asking them to answer certain questions.

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SEO
An acronym for Search Engine Optimization.

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SERP
An acronym for Search Engine Results Page.

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server
The software and hardware that runs a Web site.

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server logs
Records that measure the amount of traffic that a Web site receives. A server automatically creates a server log of all the activity it performs during a given time period, be it hours, days, or minutes.

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session
The current time period a user is active on a Web site after logging on.

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siloing
The process of organizing a Web site’s content into distinct subject categories, in order to group related content. Each silo has its own landing page and supporting pages.

SEO Glossary
site map
A Web page containing links to the pages in that Web site, similar to a table of contents.

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site navigability
Link structure for moving around a Web site.

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slip
A measure of how quickly visitors leave a Web page.

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social networking site
A Web site where people can meet and interact with one another.

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social news site
A site where news stories and articles from anywhere on the Web can be voted on by users, and the importance of a story or article is determined by the audience rather than by the editors of the site or source. Examples include Digg, StumbleUpon, and Reddit.

SEO Glossary
source code
The plain HTML code used to create a Web page.

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spam
Any tactic or Web page that is used to deceive a search engine into a false understanding of what the whole Web site is about or its importance.

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spider
A small program that search engines use to read and rank Web sites. Spiders are also referred to as robots, bots, or crawlers.

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spider trap
A situation where a spider gets caught in an endless loop and is forced to abandon the Web page because it has no other alternative.

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stemming
Using multiple forms of a word (such as customize instead of customization).

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stickiness
A measure of how long a user stays on a Web page.

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stop words
Very common words such as the, a, to, if, who, and so forth, which serve to connect ideas in search phrases but don't add much in the way of meaning to the phrases’ content. Stop words are ignored by search engines.

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subdomain
A dependent domain set up within a primary domain. For example, in http://events.classiccarcustomization.com/, events is the subdomain, .classiccarcustomization is the domain, and .com is the top-level domain.

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targeted traffic
Web traffic that is interested in a site’s product or service, and is thus more likely to provide conversions to the site.

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top navigation
The (usually attractive and styled) links found at the top of a Web page, such as the Home Page, About Us, Contact Us, and specific category links; these top links are also referred to as global navigation.

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top-level domain TLD
The root of a Web site’s URL.

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traffic
The number of visitors a Web site receives.

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trolling
The act of deliberately being rude and offensive just to make people angry on blogs and other Web forums; trolling generally gets a user banned from the blog or site.

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UGC
An acronym for User Generated Content.

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uptime
The percentage of time a Web site is up and running, not including scheduled maintenance periods.

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URL
An acronym for Uniform Resource Locator.

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user-agent sniffing
A process that identifies spiders coming to a Web site, enabling the Webmaster to keep out bad spiders.

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vanity domain
An easy-to-remember Web address used to market a specific product, person, or service.

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vertical search engines
Search engines that restrict their search by industry, geographic area, or file type.

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virtual silos
An organizational scheme in a Web site that connects related pages using links instead of moving related Web pages into new directories.

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W3C-compliant
Following HTML standards set by the World Wide Web Consortium (W3C).

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Web analytics
The study of visitor activity on an individual Web site.

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Web history
The complete records of a user’s previous Google searches and the Web sites they’ve visited or bookmarked.

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Web metrics
The measurement of what's happening on the Internet, such as the number and types of people online; the number of broadband versus dial-up connections, advertisers, and advertisements (shapes, sizes, level of annoyance); and all things related to the Internet as a whole.

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Web ring
A collection of Web sites from around the Internet that join together through interlinking in a circular structure.

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Web server
The combination of software and hardware that runs a Web site. A Web server receives each user request and serves back the requested pages to the user’s browser.

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white list
A list of Web sites or agents (such as spiders) that are approved to enter a Web site.

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wiki
A type of information site that contains all user-generated content, such as Wikipedia.

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World Wide Web Consortium W3C
An international consortium where member organizations, a full-time staff, and the public work together to develop Web standards.

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XML
An acronym for eXtensible Markup Language.

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XML site map
A document designed specifically to be readable by a search engine.