Any kind of a ship or any other vessel that transports heavy goods and materials from one port to another is called a cargo ship. These are also known as freighters and there are thousands of them that swarm the seas of the earth at any given time, because they handle the major bulk of the services of international trade. Even today, shipping is considered to be the best mode of transportation and transfer of trade goods and any sort of business item. This is because it is very safe in handling of delicate materials and is quite cheap.