A 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. Cargo ships are usually specially designed for the task, often being equipped with cranes and other mechanisms to load and unload, and come in all sizes. Today, they are almost always built of welded steel, and with some exceptions generally have a life expectancy of 25 to 30 years before being scrapped.
History of General Cargo Ships
The earliest records of waterborne activity mention the carriage of items for trade; the evidence of history and archaeology shows the practice to be widespread by the beginning of the 1st millennium BC. The desire to operate trade routes over longer distances and at more seasons of the year motivated improvements in ship design during the middle Ages. Before the middle of the 19th century, the incidence of piracy resulted in most cargo ships being armed, sometimes quite heavily, as in the case of the Manila galleons and East Indiamen. This sometimes resulted in the ships being escorted.
Classification
The modern ocean shipping business is divided into two classes:-
Liner business: typically (but not exclusively) container vessels (wherein "general cargo" is carried in 20 or 40-foot "boxes"), operating as "common carriers", calling a regularly-published schedule of ports. A common carrier refers to a regulated service where any member of the public may book cargo for shipment, according to long-established and internationally agreed rules.
Tramp-tanker business: generally this is private business arranged between the shipper and receiver and facilitated by the vessel owners or operators, who offer their vessels for hire to carry bulk (dry or liquid) or break bulk (cargoes with individually handled pieces) to any suitable port(s) in the world, according to a specifically drawn contract, called a charter party.
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Function :-
Multi-purpose vessels, designed to handle and stow a variety of freight. This may include forest products, manufactured goods, heavy equipment, vehicles, machinery, bagged goods, steel and food products, and containers. Some specialised vessels combine general cargo with heavy lift capabilities for transporting large, awkwardly shaped components to refinery, chemical processing and other plant construction projects
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