A boat is a vehicle used to travel on water. It is smaller than a ship and can be lifted out of the water and carried on a ship. Some boats have sails, some are powered by rowing with oars, and some use motors. Those that use steam engines are steamboats
These boats are usually made of wood. However, some parts are made of metals like steel and aluminium. Expensive boats may have parts from fiberglass or composite materials and some even have helicopter pads. There are some boats that can even go underwater. They are called submarines.
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