The origin of the Internet 1

The history of the internet began with the development of electronic computers in 1950s. This began with point-to-point communication between mainframe computers and terminal, expanded to point-to-point connections between computers and then early research into packet switching. Packet switched networks such as ARPANET, Mark I at NPL in the UK, CYCLADES, Merit Network, Tymnet, and Telenet, were developed in the late 1960s and early 1970s using a variety of protocols. The ARPANET in particular led to development of protocols for internetworking, where multiple separate network could be joined together into a network of networks.

The world's first operational packet switching network and the core network of a set that came to compose the global Internet

In 1982 the internet protocol suite(TCP/IP) was stangardized and the concept of a world-wild networkof fully interconnected TCP/IP network called the internet was introduced. Access to the ARPANET was expanded in1981 when the Ntional Science Foundation(NSF) developded the Computer Science Network(CSNET) and again in 1986 when NSFNET provided access to supercomputer sites in the United Sates from research and education organizations.Commercial Internet service providers(ISPs) began to emerge in the late 1980s and 1990s. The ARPANET was decommissioned in 1990.The Internet was commercialized in 1995 when NSFNET was decommissioned, removing the last restrictions on the use of the Internet to carry commercial traffic.

TCP/IP ( Transmission Control Protocol / Internet Protocol)

Reference: http://en.wikipedia.org/wiki/History_of_the_Internet