A shipment backorder is an order placed by a buyer for items that are out of stock. It’s also known as a deferred backlog or missed delivery. When an item is backordered, the customer’s order can’t be instantly fulfilled – so they’ll have to wait while the seller sources and sends it. This type of order requires timely communication between the seller and customer to ensure both parties are aware of what’s happening, and the customer is kept informed on the status of their delivery. By investing in efficient supply chain management, businesses can ensure their customers’ orders are fulfilled quickly and efficiently – even when products are backordered.