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The telegraph uses coded pulses of electrical current through long cables to transmit information.
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A telephone is a telecommunication system that transmits sound over a long distance by electricity
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Radio, sound communication by radio waves, usually through the transmission of music, news, and other types of programs
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is a telecommunication medium used for transmitting moving images in two or three dimensions and sound
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A computer is an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.
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It is a type of laptop, larger than a smartphone
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is a portable telephone that can make or receive calls through a radio frequency carrier
