Canned fish refers to fish that has been processed and sealed in a can for preservation. Common types include tuna, salmon, sardines, and mackerel. The canning process involves cooking the fish and sealing it in a can, which helps to prevent spoilage and extend shelf life. Canned fish is a convenient source of protein and can be used in various dishes. Canned fish is often enjoyed in salads, sandwiches, or pasta dishes. It is also a popular choice for camping and emergency food supplies due to its long shelf life. Many brands offer different flavors and preparations, making it versatile for many culinary uses.