eBay: An online site where individuals and businesses can sell both old and new merchandise. Originally, the site grew — person by person — across the country (and soon around the world) as people peddled their own stuff from their homes and collections. Now, eBay is also a marketplace for new merchandise.

e-commerce: All kinds of online businesses, and eBay is the superstar.

emoticons: Cute little smiley icons that show emotion. They appear next to eBay posts and can help indicate whether the writer is being (for example) sincere, ironic, or goofy about what he just wrote.