<P> The origins of the Internet date back to research commissioned by the federal government of the United States in the 1960s to build robust, fault - tolerant communication with computer networks . The primary precursor network, the ARPANET, initially served as a backbone for interconnection of regional academic and military networks in the 1980s . The funding of the National Science Foundation Network as a new backbone in the 1980s, as well as private funding for other commercial extensions, led to worldwide participation in the development of new networking technologies, and the merger of many networks . The linking of commercial networks and enterprises by the early 1990s marks the beginning of the transition to the modern Internet, and generated a sustained exponential growth as generations of institutional, personal, and mobile computers were connected to the network . Although the Internet was widely used by academia since the 1980s, the commercialization incorporated its services and technologies into virtually every aspect of modern life . </P> <P> Most traditional communications media, including telephony, radio, television, paper mail and newspapers are reshaped, redefined, or even bypassed by the Internet, giving birth to new services such as email, Internet telephony, Internet television, online music, digital newspapers, and video streaming websites . Newspaper, book, and other print publishing are adapting to website technology, or are reshaped into blogging, web feeds and online news aggregators . The Internet has enabled and accelerated new forms of personal interactions through instant messaging, Internet forums, and social networking . Online shopping has grown exponentially both for major retailers and small businesses and entrepreneurs, as it enables firms to extend their "brick and mortar" presence to serve a larger market or even sell goods and services entirely online . Business - to - business and financial services on the Internet affect supply chains across entire industries . </P> <P> The Internet has no centralized governance in either technological implementation or policies for access and usage; each constituent network sets its own policies . Only the overreaching definitions of the two principal name spaces in the Internet, the Internet Protocol address (IP address) space and the Domain Name System (DNS), are directed by a maintainer organization, the Internet Corporation for Assigned Names and Numbers (ICANN). The technical underpinning and standardization of the core protocols is an activity of the Internet Engineering Task Force (IETF), a non-profit organization of loosely affiliated international participants that anyone may associate with by contributing technical expertise . </P> <P> When the term Internet is used to refer to the specific global system of interconnected Internet Protocol (IP) networks, the word is a proper noun that should be written with an initial capital letter . In common use and the media, it is often erroneously not capitalized, viz . the internet . Some guides specify that the word should be capitalized when used as a noun, but not capitalized when used as an adjective . The Internet is also often referred to as the Net, as a short form of network . Historically, as early as 1849, the word internetted was used uncapitalized as an adjective, meaning interconnected or interwoven . The designers of early computer networks used internet both as a noun and as a verb in shorthand form of internetwork or internetworking, meaning interconnecting computer networks . </P>

Where is the main source of the internet
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