Sail supports are essential components of a sailing vessel, and include yardarms, MASTS, BOOMS, SPARS, and topmasts. Yardarms are the horizontal arms extending from the mast, while MASTS are the vertical poles that hold up the sails. BOOMS are the poles that extend from the mast to the bottom of the sail, and SPARS are the poles that support the sail's shape. Finally, topmasts are the additional MASTS that are placed on top of the main mast. All of these components work together to provide the necessary support for the sails of a sailing vessel.