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The computer is a programmable digital electronic machine that executes a series of commands to process the input data, conveniently obtaining information that is later sent to the output units. -
The telegraph is an apparatus or device that uses electrical signals for the transmission of coded text messages, such as Morse code, through wire lines or radio communications. -
The telephone is a telecommunication device created to transmit acoustic signals at a distance by means of electrical signals. -
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz and 300 gigahertz. -
The television is an electronic device intended for the reception and reproduction of television signals. Usually it has a screen and commands or controls. -
A tablet is a portable electronic device larger than a smartphone or a PDA, it is a single piece that integrates a touch screen with the fingers or a stylus. -
A mobile phone is a portable device that can make or receive calls through a radio frequency carrier while the user is moving within a telephone service area.