A Third-Party Seller is an individual or business that sells products on a platform owned by another company, such as Amazon or eBay. These sellers list their items for sale alongside products sold directly by the platform itself. They handle their own inventory, pricing, and customer service, while the platform provides the marketplace and payment processing. Third-party sellers can offer a wide variety of products, often including unique or hard-to-find items. This arrangement benefits consumers by increasing the selection available and allowing for competitive pricing. However, buyers should check seller ratings and reviews to ensure a positive shopping experience.