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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 a communication system that allows the transmission of information by means of electrical impulses and using a pre-established sign code. -
The telephone is a communication system that transmits voice and sound over long distances by electrical or electromagnetic means. It is connected to a telephone network. -
The radio is a means of communication that is based on the sending of audio signals through radio waves. -
The television is an electronic device intended for the reception and reproduction of television signals. Usually it has a screen and commands or controls. -
The tablet is a type of laptop, larger than a smartphone, integrated into a touch screen that is interacted primarily with the fingers, without the need for a physical keyboard or mouse. -
The 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.