A harbor is a place in a water body where water vessels such as ships, boats etc can take shelter either when they are not in use or either during the time of unfriendly weather conditions. Harbors are both natural and manmade.
In the case of manmade harbors, construction takes place in such a way that it can give shelter to water vessels. An example of a manmade or artificial harbor is San Diego Harbor in California where merchant ships and warships etc have been kept safe. Ports which are used for loading and unloading vessels are located within harbors.
There are many harbors in the world which have become famous and popular due to either their construction or frequent use. One example of such a harbor is Port of Los Angeles which earns annual revenue of $406.8 million due to trading and other activities. Port of New York and New Jersey is also a famous harbor which caters to the needs of ships and traders on a regular basis.
Some other famous harbors in the world are Port Miami, Sydney Harbor, Victoria Harbor, Poole Harbor, Cork Harbor in Ireland, Port of Brookings harbor and Port of Charleston which is located in South Carolina, USA.