In business, a third-party source is a supplier or service provider who is not directly controlled by the seller (first party) or the buyer (second party) in a transaction.[1] The third party is independent, even if hired by the seller or buyer. There can be more than one third party in a single transaction. A second-party source, on the other hand, is directly controlled by the buyer.[2]
In technology, a third-party source provides software or accessories that are independent of the main computer product's supplier and customer.
In e-commerce, a third-party seller (3P) is a person or company that sells items on a marketplace without the marketplace owning or storing the items. When a customer orders, the seller fulfills the order. For example, third-party sellers use Amazon's FBM (Fulfilled by Merchant) program.[3]
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