The KEEL of a ship is the backbone of the vessel, running along the bottom of the HULL and providing stability. The MAST is a vertical pole that supports the sails and rigging. The RUDDER is a flat piece of wood or metal attached to the stern of the ship that is used to steer the vessel. The HOLD is the cargo area of the ship, located below deck. The HULL is the outer shell of the ship, which provides protection from the elements. Together, these parts make up the essential components of a ship.