A TUG is a type of boat that is typically used to pull or push other vessels, usually in ports and harbors. Canoes are small, lightweight boats that are propelled by paddles. Motorboats are powered by an engine and are used for recreational activities such as fishing and water skiing. Pontoons are flat-bottomed boats with two or more airtight compartments that provide buoyancy. Catamarans are two-hulled vessels that are designed for speed and stability.