The term luxury yacht refers to a very expensive privately owned yacht which is professionally crewed.[citation needed] Also known as a Super Yacht, a luxury yacht may be either a sailing or motor yacht.
A steamboat or steamship, sometimes called a steamer, is a ship in which the primary method of propulsion is steam power, typically driving propellers or paddlewheels.
The term steamboat is usually used to refer to smaller steam-powered boats working on lakes and rivers, particularly riverboats; steamship generally refers to larger steam-powered ships, usually ocean-going, capable of carrying a (ship's) boat. The term steamwheeler is archaic and rarely used.
Engines to produce steam were developed and adapted in the late 18th century for use on ships, but did not become widely used until the early 19th century. Growth in their use was rapid on United States rivers, and steamships gradually replaced sailing ships for commercial shipping through the 19th century[1] and in turn were overtaken by diesel-driven ships in the second half of the 20th century. Most warships used steam propulsion until the advent of the gas turbine. Today, nuclear-powered warships and submarines use steam to drive turbines, but they are not referred to as steamships.
Screw-driven steamships generally carry the ship prefix "SS" before their names, meaning 'Steam Ship' (or Screw Steamer, or 'screw-driven steamship'), paddle steamers usually carry the prefix "PS" and steamships powered by steam turbine may be prefixed "TS" (turbine ship). The term steamer is occasionally used, out of nostalgia, for diesel motor-driven vessels, prefixed "MV".
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