A small watercraft used for transportation, fishing or recreation. Some boats are powered by sail, some by motor, and some by paddles or oars. A boat is small enough that it may be lifted onto a larger vessel. But submarines are also called boats. Different types of boats are designed and built for different purposes. Traditional boats may vary widely in size and style as they were developed by a local culture for work in a particular trade or region. Boat types that could be carried on ships could spread widely around the world.