What are the key features of eBay?

eBay is an online marketplace that enables users to buy and sell a wide variety of goods, both new and used. Key features include auction-style listings, where sellers can set starting bids and buyers can place bids until the auction ends, as well as fixed-price listings for immediate purchases. eBay also offers buyer and seller protections, a feedback system for reputation management, and various payment options, including PayPal and credit cards. Additionally, users can access mobile apps for convenient browsing and purchasing on the go.