What is FBA on Amazon? FBA stands for Fulfillment by Amazon, a service where sellers store their products in Amazon’s warehouses. When a customer places an order, Amazon picks, packs, and ships the product on the seller’s behalf. In addition, Amazon handles customer service and returns. By using FBA, sellers can offer fast shipping, including access to Amazon Prime, while focusing on sourcing products and growing their business. This service helps streamline operations and gives sellers the ability to reach millions of customers worldwide.