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ARPANET was one of the first general-purpose computer networks. It was created by the Advanced Research Projects Agency (ARPA) of the U.S. These ideas were first realized in ARPANET, which established the first host-to-host network connection on October 29, 1969. Host-to-host interactions were envisioned, along with access to specialized resources (such as supercomputers and mass storage systems) and interactive access by remote users to the computational powers of time-sharing systems located elsewhere. Time-sharing systems allowed a computer’s resources to be shared in rapid succession with multiple users, cycling through the queue of users so quickly that the computer appeared dedicated to each user’s tasks despite the existence of many others accessing the system “simultaneously.” This led to the notion of sharing computer resources (called host computers or simply hosts) over an entire network. By the early 1960s computer manufacturers had begun to use semiconductor technology in commercial products, and both conventional batch-processing and time-sharing systems were in place in many large, technologically advanced companies. The first computer networks were dedicated special-purpose systems such as SABRE (an airline reservation system) and AUTODIN I (a defense command-and-control system), both designed and implemented in the late 1950s and early 1960s. ( See electronic commerce.) Origin and development Early networksĪ Packet's Tale © World Science Festival ( A Britannica Publishing Partner) See all videos for this article The Internet has proved to be a spawning ground for a large and growing number of “e-businesses” (including subsidiaries of traditional “brick-and-mortar” companies) that carry out most of their sales and services over the Internet.

It supports access to digital information by many applications, including the World Wide Web. It supports human communication via social media, electronic mail (e-mail), “chat rooms,” newsgroups, and audio and video transmission and allows people to work collaboratively at many different locations. The Internet provides a capability so powerful and general that it can be used for almost any purpose that depends on information, and it is accessible by every individual who connects to one of its constituent networks. By 2020, approximately 4.5 billion people, or more than half of the world’s population, were estimated to have access to the Internet. Sometimes referred to as a “network of networks,” the Internet emerged in the United States in the 1970s but did not become visible to the general public until the early 1990s. Internet, a system architecture that has revolutionized communications and methods of commerce by allowing various computer networks around the world to interconnect.

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