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The US Department of Defense awarded contracts as early as the 1960s for packet network systems, including the development of the ARPANET
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Packet switching networks such as ARPANET, NPL network, CYCLADES, Merit Network, Tymnet, and Telenet, were developed in the late 1960s and early 1970s using a variety of communications protocols.
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In the 1980s, the work of Tim Berners-Lee in the United Kingdom, on the World Wide Web, theorised the fact that protocols link hypertext documents into a working system,[4] marking the beginning of the modern Internet.
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Access to the ARPANET was expanded in 1981 when the National Science Foundation (NSF) funded the Computer Science Network (CSNET)
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In 1982, the Internet protocol suite (TCP/IP) was introduced as the standard networking protocol on the ARPANET
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In the early 1980s the NSF funded the establishment for national supercomputing centers at several universities, and provided interconnectivity in 1986 with the NSFNET project
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Commercial Internet service providers (ISPs) began to emerge in the very late 1980s
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Limited private connections to parts of the Internet by officially commercial entities emerged in several American cities by late 1989 and 1990,
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The ARPANET was decommissioned in 1990
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The Internet's takeover of the global communication landscape was almost instant in historical terms: it only communicated 1% of the information flowing through two-way telecommunications networks in the year 1993
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Since the mid-1990s, the Internet has had a revolutionary impact on culture and commerce, including the rise of near-instant communication by electronic mail, instant messaging, voice over Internet Protocol (VoIP) telephone calls, two-way interactive video calls, and the World Wide Web with its discussion forums, blogs, social networking, and online shopping sites.
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the NSFNET was decommissioned in 1995, removing the last restrictions on the use of the Internet to carry commercial traffic.