Date-mark, also known as expiration date, is the date printed on food and other perishable products indicating the date when the product is no longer safe to consume. Other synonyms for date-mark include sell-by date, use-by date, best before date, and freshness date. The sell-by date is the date by which retailers are instructed to remove the product from their store shelves. The use-by date is the date by which consumers should use the product for optimal quality and safety. The best before date is the date by which the product will be at its best quality but may still be safe to consume after. The freshness date is similar to the best before date and indicates the date by which the product will maintain its freshness and quality.