"Out of Stock" refers to a situation where a product is not currently available for purchase. This can happen for various reasons, such as high demand, supply chain issues, or production delays. When an item is out of stock, customers cannot buy it until it is restocked. Retailers often display an "Out of Stock" notice on their websites or in stores to inform customers. This helps manage expectations and encourages shoppers to check back later or consider alternative products. Some retailers may also offer options to sign up for notifications when the item becomes available again.