eBay is an online auction and shopping website where individuals and businesses can buy and sell a broad variety of new, used, and unique items. It's known for its auction-style sales model but also offers "Buy It Now" options for immediate purchase. eBay's vast product categories range from electronics, fashion, and collectibles to cars and real estate. The platform provides a global marketplace for consumers and sellers, offering various tools and services to facilitate transactions, including user feedback systems, search filters, and payment processing. eBay is significant in e-commerce for its pioneering role in online consumer-to-consumer and business-to-consumer sales.