Amazon Fulfillment by Amazon (FBA) is a service offered by Amazon that allows sellers to store their products in Amazon's fulfillment centers and have Amazon handle the shipping and customer service for those products. When a customer orders a product, Amazon will pick, pack, and ship the product to the customer, and also handle any customer service inquiries related to the product. By using FBA, sellers can take advantage of Amazon's reputation for fast and reliable shipping, and also benefit from Amazon's Prime shipping program, which can increase sales. Additionally, FBA allows sellers to use Amazon's customer service team to handle customer inquiries and returns, which can save the seller time and resources.