Abbreviation: cv, full name naval vessels .
Ships are considered to be part of the territory of a country and are subject only to the laws of the country and recognized international law. Those that perform direct combat missions are called combat vessels, and those that perform auxiliary combat missions are auxiliary combat vessels.
Ships are mainly used for maritime maneuvering operations, strategic nuclear raids, protecting their own side or destroying the enemy's sea lines of communication, blockade or counter-blockade, participating in landing or anti-landing operations, as well as undertaking maritime supply, transport, repair, life-saving, medical, reconnaissance, investigation, surveying, engineering and testing and other security services, mainly combat ships and auxiliary combat ships of two major categories.
Expanded
Combat ships according to its mission aircraft carriers, battleships, cruisers, destroyers, frigates (boats), minelaying ships (boats), minesweepers (boats), landing ships (boats), submarines, missile boats, gunboats and torpedo boats, submarine hunters (boats), etc.;
Auxiliary combat ships. According to its mission is divided into repair ships, transportation ships, supply ships, survey ships, salvage lifeboats, hospital ships, tugboats and so on.
In the same kind of ship, according to its displacement and main armament can be divided into different levels. Combat ships, according to the custom, generally the displacement of 500 tons or more surface ships called ship, while the displacement of 500 tons of surface ships called boat. Submarines are called boats regardless of tonnage.