A sailboat or sailing boat is a boat propelled partly or entirely by sails. The generic term covers a variety of boats, larger than small vessels such as sailboards and smaller than sailing ships, but distinctions in the size are not strictly defined and what constitutes a sailing ship, sailboat, or a smaller vessel (such as a sailboard) varies by region and maritime culture.At present, a great number of sailboat-types may be istinguished.Apart from size, sailboats may be distinguished by a hull configuration (monohull, catamaran, trimaran), keel type (full, fin, wing, centerboard etc.), purpose (sport, racing, cruising), number and configuration of asts,and sail plan. Although sailboat terminology has varied across history, many terms now have specific eanings in the context of modern yachting.The following sub-sections outline the most popular monohull sailing essels. tional types of vessels, such as multi-hull, are not discussed in these sub-sections.SloopToday, the st common sailboat is the sloop, which features one mast and two sails: a normal mainsail, and a headsail. his simple is y efficient for sailing towards the wind. The mainsail is attached to the mast nd the boom, which is capable of swinging across the boat, depending on the direction nd.Depending on the size and design of the headsail it n be called a jib, Genoa, or spinnaker. When sailing irectlywnwind, a common configuration is o have the ailed to one side of the boat, and the mainsailsailed to the other; this configuration is called "wing on wing".