amazon fba/fbm are two fulfillment models on Amazon. FBA (Fulfilled by Amazon) involves sending inventory to Amazon’s warehouses, where they handle storage, packing, and shipping. FBM (Fulfilled by Merchant) means the seller manages these logistics independently. FBA allows sellers to offer Prime shipping and simplifies customer service, but includes storage and handling fees. FBM offers more control and can be cost-effective for niche or bulky products. Choosing between the two depends on a seller’s business model, volume, and scalability goals.