Canned tuna is a popular food product made from fish, specifically the tuna species. It is typically cooked and preserved in a can, which helps to extend its shelf life. Canned tuna is available in various forms, including chunk light, solid white, and flaked, and can be packed in water, oil, or brine. This convenient source of protein is often used in salads, sandwiches, and casseroles. Canned tuna is rich in essential nutrients, such as omega-3 fatty acids and vitamin D, making it a healthy choice for many diets. It is also relatively affordable and easy to store.