The initial purpose of the project was for military purposes. At that time the United States Department of Defense (U.S. Department of Defense) create a system of computer networks that are spread by linking computers in areas vital to overcome the problem if there is a nuclear attack and to avoid any centralized information, which in the event of war can easily be destroyed.
At first ARPANET just simply connect the four sites are the Stanford Research Institute, University of California, Santa Barbara, University of Utah, where they form an integrated network in 1969, and in general the ARPANET was introduced in October 1972. Not long after the project is growing rapidly in all regions, and all universities in the country wants to join, thus making it difficult to set the ARPANET.
Therefore, the ARPANET was split Manjadi two, namely "MILNET" for military purposes and the "ARPANET" new smaller for non-military purposes such as, universities. Combined both networks came to be known by the name of DARPA Internet, which then reduces to the Internet.
