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A computer is an electronic device for storing and processing data, according to instructions given to it in a variable program.
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A telegraph is a communications system in which information is transmitted over a wire through a series of electrical current pulses (Morse code).
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A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.
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A radio is the technology of signaling and communicating using radio waves. It through the transmission of music, news, and other types of programs.
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A television is a telecommunication medium used for transmitting moving images in black and white or in color, and in two or three dimensions and sound.
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A mobile phone is a telephone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network.
