A yacht /jɒt/ is a sail or power vessel used for pleasure, cruising, or racing.[2][3][4] There is no standard definition, so the term applies to such vessels that have a cabin with amenities that accommodate overnight use. To be termed a yacht, as opposed to a boat, such a pleasure vessel is likely to be at least 33 feet (10 m) in length and may have been judged to have good aesthetic qualities.[1]

The Commercial Yacht Code classifies yachts 79 ft (24 m) and over as large.[5] Such yachts typically require a hired crew[1] and have higher construction standards.[5] Further classifications for large yachts are: commercial—carrying no more than 12 passengers, private—solely for the pleasure of the owner and guests, or by flag, the country under which it is registered.[6] A superyacht (sometimes megayacht) generally refers to any yacht (sail or power) longer than 131 ft (40 m).[7]

Racing yachts are designed to emphasize performance over comfort.[8] Charter yachts are run as a business for profit.[7] As of 2020 there were more than 15,000 yachts of sufficient size to require a professional crew.