It is a global system of computer networks (systems of communication between several computers) which consists of millions of private, public, business and government networks, the Internet, It is a telecommunication device for speaking to someone which sends an electric signal (sound) along a wire to a similar device, the phone, It is the most widely used means of telecommunication which sends and receives pictures together with sound, television, It is a means of communication which is based on sending and receiving sounds using electromagnetic waves instead of wires, the radio, It is a telecommunication device which operates using radio signals and can be freely moved from one place to another and used in cars, trains, etc., the mobile phone

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