Fulfillment by Amazon (FBA) is a service provided by Amazon that allows third-party sellers to store their products in Amazon's fulfillment centers

Advertising Cost of Sale (ACoS) is a common Amazon metric that reflects the actual expense of generating revenues from customer transactions due to advertising.

Fulfillment by Merchant (FBM) is a method of fulfilling orders in which a third-party seller handles all aspects of the order fulfillment process, including storage, picking, packing, and shipping.