Sometimes referred to as a “network of networks,” the Internet emerged in the United States in the 1970s but did not become visible to the general public until the early 1990s.
In the United States, Telenet and Tymnet were two such packet networks.
Neither supported host-to-host communications; in the 1970s this was still the province of the research networks, and it would remain so for many years.
TCP, which originally included the Internet protocol (IP), a global addressing mechanism that allowed routers to get data packets to their ultimate destination, formed the TCP/IP standard, which was adopted by the U. In 1985–86 NSF funded the first five supercomputing centres—at Princeton University, the University of Pittsburgh, the University of California, San Diego, the University of Illinois, and Cornell University.
In the 1980s NSF also funded the development and operation of the NSFNET, a national “backbone” network to connect these centres.