
Cargo ship Ī tanker is a ship designed to transport liquids in bulk. General cargo ships include "multi-purpose and project vessels and roll-on/roll-off cargo".

The UNCTAD review of maritime transport categorizes ships as: oil tankers, bulk (and combination) carriers, general cargo ships, container ships, and "other ships", which includes "liquefied petroleum gas carriers, liquefied natural gas carriers, parcel (chemical) tankers, specialized tankers, reefers, offshore supply, tugs, dredgers, cruise, ferries, other non-cargo".

However, due to high operating costs, today these fleets are in many cases sailing under the flags of nations that specialize in providing manpower and services at favourable terms.

Most countries of the world operate fleets of merchant ships. They come in myriad sizes and shapes, from twenty-foot (6 m) inflatable dive boats in Hawaii, to 5,000-passenger casino vessels on the Mississippi River, to tugboats plying New York Harbor, to 1,000-foot (300 m) oil tankers and container ships at major ports, to passenger-carrying submarines in the Caribbean. This is in contrast to pleasure craft, which are used for personal recreation, and naval ships, which are used for military purposes. Historical merchant trading ship: a Dutch fluyt cargo vessel from the late 17th centuryĪ merchant ship, merchant vessel, trading vessel, or merchantman is a watercraft that transports cargo or carries passengers for hire.
