what does on back order mean

what does on back order mean refers to a situation where a product is out of stock but is expected to be available again in the future. When an item is on back order, it means that customers can still place an order for the product, but the item will not be shipped immediately. The item will be shipped once it becomes available. Back orders are common in retail and e-commerce when demand for a product exceeds the available supply, or when there are delays in production or restocking. Many online stores offer customers the option to place an order for back-ordered items, often providing an estimated date of arrival. While waiting for a back-ordered item can be frustrating, it gives customers the opportunity to secure their purchase in advance, often with the promise of delivery once stock is replenished.