Cargo ship or freighter is any sort of ship or vessel that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's seas and oceans each year; they handle the bulk of international trade.
Tug is a boat that maneuvers vessels by pushing or towing them. Tugs move vessels that either should not move themselves, such as ships in a crowded harbor or a narrow canal,or those that cannot move by themselves, such as barges, disabled ships, or oil platforms.
Chemical tanker is a type of tanker designed to transport chemicals in bulk. Chemical tankers generally range from 5,000 metric tons DWT to 40,000 DWT in size, which is considerably smaller than the average size of other tanker types due to the specialised nature of their cargoe.
Bulk carrier, bulk freighter, or bulker is a merchant ship specially designed to transport unpackaged bulk cargo, such as grains, coal, ore, and cement in its cargo holds.
