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The telegraph is an apparatus or device that uses electrical signals to transmit coded text messages, such as Morse code, over wire lines or radio communications
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The telephone is a telecommunication device designed to transmit acoustic signals at a distance by means of electrical signals.
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Radiocommunication is a form of telecommunication that is carried out through radio waves or Hertzian waves, which in turn is characterized by the movement of electric fields and magnetic fields.
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Television is a system for the transmission and reception of images and sounds at a distance that simulate movements, which uses a diffusion mechanism.
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The computer, is a programmable digital machine that executes a series of commands to process the input data, obtaining convenient information that is subsequently sent to the output units.
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The computer, is a programmable digital machine that executes a series of commands to process the input data, obtaining convenient information that is subsequently sent to the output units.
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A mobile phone or cell phone is a portable phone that can make or receive calls through a radio frequency carrier.
