The Web & Communication

Telecommunication, science and practice of transmitting information by electromagnetic means. Modern telecommunication centres on the problems involved in transmitting large volumes of information over long distances without damaging loss due to noise and interference. The basic components of a modern digital telecommunications system must be capable of transmitting voice, data, radio, and television signals. Digital transmission is employed in order to achieve high reliability and because the cost of digital switching systems is much lower than the cost of analog systems. In order to use digital transmission, however, the analog signals that make up most voice, radio, and television communication must be subjected to a process of analog-to-digital conversion.

The Web & Communication Encyclopedia Articles

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Satellite communication
Satellite communication, in telecommunications, the use of artificial satellites to provide communication links between various points on Earth. Satellite communications play a vital role in the global telecommunications system. Approximately 2,000 artificial satellites orbiting Earth relay analog...
Encyclopedia / The Web & Communication
Australia's AUSSAT-1 communications satellite being released in low Earth orbit from the payload bay of the U.S. space shuttle orbiter Discovery, August 27, 1985. The satellite subsequently was boosted into a geostationary orbit by means of an attached rocket motor.
Alexander Graham Bell
Alexander Graham Bell, Scottish-born American inventor, scientist, and teacher of the deaf whose foremost accomplishments were the invention of the telephone (1876) and the refinement of the phonograph (1886). Alexander (“Graham” was not added until he was 11) was born to Alexander Melville Bell...
Biography
Bell, Alexander Graham
Internet
Internet, a system architecture that has revolutionized communications and methods of commerce by allowing various computer networks around the world to interconnect. Sometimes referred to as a “network of networks,” the Internet emerged in the United States in the 1970s but did not become visible...
Encyclopedia / The Web & Communication
Mobile telephone
Mobile telephone, portable device for connecting to a telecommunications network in order to transmit and receive voice, video, or other data. Mobile phones typically connect to the public switched telephone network (PSTN) through one of two categories: cellular telephone systems or global...
Encyclopedia / The Web & Communication
People can quickly and easily communicate with one another over long distances using computers and mobile phones.
Texting
Texting, act of sending short messages with cell phones, usually using the Short Messaging Service (SMS). SMS was developed in the United Kingdom in the late 1980s, and the first text message was sent on December 3, 1992. An SMS commercial service was launched in the United Kingdom in 1995. Text...
Encyclopedia / The Web & Communication
Students using a cell phone for text messaging, Quezon City, Philippines.
ARPANET
ARPANET, experimental computer network that was the forerunner of the Internet. The Advanced Research Projects Agency (ARPA), an arm of the U.S. Defense Department, funded the development of the Advanced Research Projects Agency Network (ARPANET) in the late 1960s. Its initial purpose was to link...
Encyclopedia / The Web & Communication
Wi-Fi
Wi-Fi, networking technology that uses radio waves to allow high-speed data transfer over short distances. Wi-Fi technology has its origins in a 1985 ruling by the U.S. Federal Communications Commission that released the bands of the radio spectrum at 900 megahertz (MHz), 2.4 gigahertz (GHz), and...
Encyclopedia / The Web & Communication
Wi-Fi
Tim Berners-Lee
Tim Berners-Lee, British computer scientist, generally credited as the inventor of the World Wide Web. In 2004 he was awarded a knighthood by Queen Elizabeth II of the United Kingdom and the inaugural Millennium Technology Prize (€1 million) by the Finnish Technology Award Foundation. Computing...
Biography
Berners-Lee, Sir Tim
Receiver
Receiver, in electronics, any of various devices that accept signals, such as radio waves, and convert them (frequently with amplification) into a useful form. Examples are telephone receivers, which transform electrical impulses into audio signals, and radio or television receivers, which accept ...
Encyclopedia / The Web & Communication
Twitter
Twitter, online microblogging service for distributing short messages among groups of recipients via personal computer or mobile telephone. Twitter incorporates aspects of social networking Web sites, such as Myspace and Facebook, with instant messaging technologies to create networks of users who...
Encyclopedia / The Web & Communication
Evan Williams (left) and Biz Stone, founders of Twitter, using the social networking service at the company's headquarters in San Francisco, April 13, 2009.

The Web & Communication Encyclopedia Articles

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