Internet is a global system of interconnected computer networks that use the standard Internet protocol (often called TCP/IP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by networking technologies. The history of the Internet begins with the development of electronic computers in the 1950s. The US Department of Defense awarded contracts as early as the 1960s, including for the development of the ARPANET project. The first message was sent over the ARPANET in 1969 from computer science laboratory at University of California, Los Angeles to the second network at Stanford Research Institute (SRI). There are many organizations, corporations, governments, schools, private citi