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Ships, etc.
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying passengers or goods, or in support of specialized missions, such as defense, research and fishing. Historically, a "ship" was a sailing vessel with at least three square-rigged masts and a full bowsprit. Ships are generally distinguished from boats, based on size, shape, load capacity, and tradition. Because ships are constructed using the principles of naval architecture that require same structural components, their classification is based on their function such as that suggested by Paulet and Presles, which requires modification of the components.
The categories accepted in general by naval architects are:

    High-speed craft – Multihulls including wave piercers, small-waterplane-area twin hull (SWATH), surface effect ships and hovercraft, hydrofoil, wing in ground effect craft (WIG).

    Off shore oil vessels – Platform supply vessel, pipe layers, accommodation and crane barges, non and semi-submersible drilling rigs, production platforms, floating production storage and offloading units.

    Fishing vessels

    Motorised fishing trawlers, trap setters, seiners, longliners, trollers & factory ships.

    Traditional sailing and rowed fishing vessels and boats used for handline fishing

    Harbour work craft

    Cable layers

    Tugboats, dredgers, salvage vessels, tenders, Pilot boats.

    Floating dry docks, floating cranes, lightership.

    Dry cargo ships – tramp freighters, bulk carriers, cargo liners, container vessels, barge carriers, Ro-Ro ships, refrigerated cargo ships, timber carriers, livestock & light vehicle carriers.

    Liquid cargo ships – Oil tankers, liquefied gas carriers, chemical carriers.

    Passenger vessels

    Liners, cruise and Special Trade Passenger (STP) ships

    Cross-channel, coastal and harbour ferries.

    Luxury & cruising yachts

    Sail training and multi-masted ships

    Recreational boats and craft – rowed, masted and motorised craft

    Special-purpose vessels – weather and research vessels, deep sea survey vessels, and icebreakers.

    Submersibles – industrial exploration, scientific research, tourist and hydrographic survey.

    Warships and other surface combatants – aircraft carriers, destroyers, frigates, corvettes, minesweepers, etc.