Ecommerce fulfillment centers receive and store products from merchants, then pick, pack and ship those products to customers when they are ordered. This process eliminates the need for merchants to maintain their physical inventory or warehouses. In addition, fulfillment centers often offer order tracking, customer service, and other features that can benefit online retailers. For these reasons, many merchants choose to outsource their eCommerce fulfillment needs to a center that specializes in this service.