Terns are a type of fork-tailed marine bird that belong to the family Sternidae. They are found in many parts of the world, including coastal areas, islands, and inland lakes. Terns have long, pointed wings and a forked tail, which helps them to maneuver quickly and efficiently in the air. They feed mainly on fish, but also eat insects, crustaceans, and other small aquatic creatures. Terns are highly social birds, often gathering in large flocks to migrate or forage.