whats back order

whats back order refers to an item that a seller does not have in stock at the time of purchase but expects to receive from the supplier or manufacturer later. When an item is placed on backorder, customers are usually notified about the expected restock date. Backordering is common in eCommerce and retail when demand exceeds supply. While it can delay fulfillment, backordering ensures that customers still have the opportunity to purchase popular products.