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Most traditional communications media, including telephony, radio, television, paper mail and newspapers are being 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.

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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.The Internet has no centralized governance in either technological implementation or policies for access and usage; each constituent network sets its own policies.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.Early international collaborations on the ARPANET were rare.

European developers were concerned with developing the X.25 networks.

ARPANET development began with two network nodes which were interconnected between the Network Measurement Center at the University of California, Los Angeles (UCLA) Henry Samueli School of Engineering and Applied Science directed by Leonard Kleinrock, and the NLS system at SRI International (SRI) by Douglas Engelbart in Menlo Park, California, on 29 October 1969.

The third site was the Culler-Fried Interactive Mathematics Center at the University of California, Santa Barbara, followed by the University of Utah Graphics Department.

Although other network protocols such as UUCP had global reach well before this time, this marked the beginning of the Internet as an intercontinental network.

Public commercial use of the Internet began in mid-1989 with the connection of MCI Mail and Compuserve's email capabilities to the 500,000 users of the Internet.

and generated rapid growth as institutional, personal, and mobile computers were connected to the network.