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

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.

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

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

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.

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

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