A regatta entry is a vessel that participates in a regatta, which is a series of BOAT races. The most common types of vessels used in regattas are yachts, boats, sailboats, and sloops. Yachts are large, luxurious vessels with five letters, boats are smaller vessels with four letters, sailboats are vessels propelled by sails with eight letters, and sloops are single-masted sailing vessels with five letters.