The merchant navy is distinctly different from the navy that is part of the defense forces. The commercial fleet normally transports cargo. There are passenger ships as well.
Bulk Carrier: Carries unpackaged bulk cargo, like grains, coal, ore and cement.
Container Ship: Carries containerized cargo; containers filled with cargo can be loaded directly into the ship. They can be unloaded directly.
Reefer Ship: Carries perishables like vegetables, fruits, meat, fish and dairy products. Need refrigeration for preserving the cargo.
Tanker: Carries petroleum products or other liquids like liquefied natural gas in bulk. The term oil tanker is popular. The vessel has pumps for loading and unloading by direct pumping.
Roll-on and Roll off Ship: Carries wheeled cargo such as automobiles, and trailers which are driven on and off the ship on their won wheels.
Passenger Ships: Carries passengers and some freight. Ocean liners transport people from one seaport to another according to a regular schedule.
Barge: A long large boat usually with a flat bottom. Normally it has no power of its own: it is towed by other craft. – B.S. Warrier
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