FBA (Fulfillment by Amazon) is a service where sellers send inventory to Amazon's fulfillment centers and Amazon handles all logistics — storage, picking, packing, shipping, and returns. FBA products qualify for Prime shipping, which significantly improves Buy Box eligibility.
FBA vs FBM (Fulfilled by Merchant) status affects repricing strategy. FBA sellers generally need less aggressive pricing to win the Buy Box because Amazon's algorithm weights fulfillment reliability heavily. FBM sellers often need to compensate with more competitive pricing.