Ships can usually be distinguished from boats based on size and the ship's ability to operate independently for extended periods.A commonly used rule of thumb is that if one vessel can carry another, the larger of the two is a ship.
As dinghies are common on sailing yachts as small as 35 feet (11 m), this rule of thumb is not foolproof. In a more technical and now rare sense, the term ship refers to a sailing ship with at least 3 square-rigged masts and a full bowsprit, with lesser ships described by their sailplan (e.g., barque, brigantine, etc.).
A number of large vessels are traditionally referred to as boats. Submarines are a prime example.
Other types of large vessels which are traditionally called boats are the Great Lakes freighter, the riverboat, and the ferryboat.
Though large enough to carry their own boats and heavy cargoes, these vessels are designed for operation on inland or protected coastal waters.
Ship is a large vessel that floats on water. Ships are generally distinguished from boats based on size and cargo or passenger capacity. In traditional terms, ships were considered to be vessels which had at least one continuous water-tight deck extending from bow to stern.
However, some modern designs for ships, and boats, have made that particular definition less accurate. Ships may be found on lakes, seas, and rivers and they allow for a variety of activities, such as the transport of people or goods, fishing, entertainment, public safety, and warfare.
Ships and boats have developed alongside mankind. In major wars, and in day to day life, they have become an integral part of modern commercial and military systems. Fishing boats are used by millions of fishermen throughout the world.
Military forces operate highly sophisticated vessels to transport and support forces ashore. Commercial vessels, nearly 35,000 in number, carried 7.4 billion tons of cargo in 2007.
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