Code marking is the embossing or printing of figures on can ends and food packaging to show production information such as the use-by or best-before date, batch number, and factory code. These codes enable traceability: when a fault is found, the affected batch can be identified and recalled precisely rather than sweeping entire product lines. Consumers read the date marks for freshness and safety, while the batch codes speak to manufacturers and regulators. Clear, durable marking is a legal requirement in most jurisdictions, and its accuracy underpins the whole system of food recalls and stock rotation.