backorder amazon refers to a situation where an item on Amazon is temporarily out of stock but will be shipped once it becomes available again. This is common for high-demand or newly released products. Customers can still place an order, with the understanding that shipping will be delayed until inventory is replenished. Amazon typically provides an estimated delivery window during the checkout process. Sellers use backorders to capture sales without losing customers to competitors, especially when restocking is imminent. However, if delays extend too long, customers may cancel the order. For Fulfilled by Amazon (FBA) sellers, backorders are often tied to inbound shipments en route to fulfillment centers. Understanding the mechanics of backorders helps customers set realistic expectations and enables sellers to better manage inventory and communication.