The origin of the Internet 2

The term "Internet " was adopted in the first RFC published on the TPC protocol as an abbreviation of the term internetworking and the two terms were used interchangeably.
As interest in widespread networking grew and new application for it were developed, the Internet's technologies spread throughout the rest of the world.The network-agnostic approach in TCP/IP meant that it was easy to use any existing network infrastructure.
Many sites unable to link directly to the Internet started to create simple gateways to allow transfer of email ,at that time the most important application.Sites which only had intermittent connections used UUCP(an abbreviation of Unix-to-Unix Copy) or FidoNet(a worldwide computer network that is used for communication between bulletin board systems) and relied on the gateways between these networks and the Internet. Some gateway services went beyond simple email peering, such as allowing to FTP(File Transfer Protocol) sites via UUCP or email.

Reference:en.wikipedia.org/wiki/History_of_the_Internet#Transition_towards_the_Internet

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