The distinction between a ship and a boat varies depending on regional definitions, but as a general rule, a boat can fit onto a ship, but a ship cannot fit onto a boat. A ship, in other words, is a very large ocean-going vessel, while a boat tends to be much smaller. Additionally, a ship usually is defined as having a displacement larger than 500 tons. During the age of sailing, a craft with three or more rigged masts was considered to be a ship, but this definition has been superseded, as different methods of power generation are used on modern ships.
