"Use By" is a label found on food packaging that indicates the last date the product should be consumed for safety reasons. After this date, the food may not be safe to eat, as it can spoil or develop harmful bacteria. It is important to follow this guideline to avoid foodborne illnesses. Unlike "Best Before" dates, which suggest when a product is at its best quality, "Use By" dates are strict. Products like dairy, meat, and prepared meals often carry "Use By" dates, emphasizing the need for careful handling and timely consumption to ensure health and safety.