This excerpt taken from the EBAY 10-K filed Feb 28, 2007.
Our Marketplaces platforms are fully automated, topically arranged, and easy-to-use online services that seek to provide availability 24 hours a day, seven days a week, enabling sellers to list items for sale and buyers to bid for and purchase items of interest, and all users to browse through listed items from any place in the world at any time. The platforms include software tools and services, available either for no charge or for a fee, that allow buyers and sellers to trade with one another more easily and efficiently. The Marketplaces platforms consist of our core online commerce platform, eBay.com, and adjacent platforms consisting of Shopping.com, our classifieds websites and Rent.com. Marketplaces earns revenue from listing, feature and final value fees paid by sellers, lead referral fees and advertising fees.