How did Navies Originate?

The first navies were created when the armed men of a tribe or town went to sea in large ships they had, in order to give a battle to their enemies and raid territory from the sea. The ships used were ordinary fishing or commercial ships. Later on, ships were especially designed for purposes of war.

Do you know?
     Originally, the navy of a country meant all of its ships, whether used for war, carrying of merchandise or fishing.

At the time of ancient Greeks and Romans, the very first long ship was built for speed in war, instead of round ones to carry merchandise. When the Persians threatened to attack Athens in 483 B.C., the Greeks increased their navy from fifty to one hundred long ships. By the end of the fifth century B.C., this fleet of long ships had increased to 300 and later even to 360, which makes it quite a navy! In times of peace, these warships were kept on slips and undercover in sheds.
The most ancient warships were many-oared galleys, each requiring a  great number of rowers. These great rowing galleys were used to ram other ships or as a mean of boarding the enemy ships.
In both the ancient Greek and Roman navies, there were many similarities to the organization of a modern navy. The Greeks had a captain, a sailing master, a number of petty officers, seamen and oarsmen, and soldiers or marines. The Romans always had a body of soldiers, called the classici, who were especially assigned to service in the navy.
Today, of course, a navy is a very complicated organization with dozens of types of ships and units organized to maintain them. Pakistan Navy is one of the best navies in the world.