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The telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid between stations. -
The telephone is a telecommunication device created to transmit acoustic signals at a distance by means of electrical signals. -
Radio is a means of communication that is based on sending audio signals through radio waves, although the term is also used for other forms of remote audio transmission such as Internet radio. -
John Logie Baird invented television after several attempts to copy the electromagnetic wave system of radio. With a great financial effort and without receiving help from investors, Baird managed to revolutionize telecommunications with this incredible device. -
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. -
The computer is a programmable digital machine that executes a series of commands to process the input data, conveniently obtaining information that is later sent to the output units. -
A tablet is a portable electronic device larger than a smartphone or PDA, it is a single piece that integrates a touch screen that emits light and with which you interact primarily with your fingers, without need for physical keyboard or mouse.