An e-commerce business model can also be described by the types of Web sites used for e-commerce activities. Some of the most common are manufacturer sites and e-tailer (online retailer) Web sites (which sell goods or services online), subscription sites (which charge a fee for online content), and brokerage sites (which bring buyers and sellers together and facilitate transactions between them). Online auction sites are brokerage sites that allow individuals and/or companies to bid on merchandise and the winning bidder purchases the item. Other brokerage sites that facilitate transactions include financial brokerages, consumer brokerages, and market exchanges. Brokerage sites typically obtain revenue by charging commissions, fees for each brokered transaction or annual fees.