FBM stands for "Fulfilled by Merchant" and refers to a method of selling products on Amazon where the seller is responsible for storing inventory, packing, and shipping orders, as well as handling customer service and returns. In contrast, FBA (Fulfilled by Amazon) is a service where Amazon stores, packs, and ships products on behalf of the seller. FBM is usually the only fulfillment method available to new merchants selling on Amazon, as FBA requires a few approvals, demonstrated inventory turnover, and takes time to set up. FBM can be beneficial for sellers with exclusive products with low sales frequency, small volume products, low-profit products, or hard-to-ship products. FBM gives merchants greater control and predictability over their inventory and fulfillment operations, and sellers with expertise in logistics and efficient operations can improve their overall margins.