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A computer is a device that performs processes, calculations and operations based on instructions provided by a software or hardware program. -
A device that employs electrical signals for the transmission of coded text messages, as with Morse code, over wired lines or radio communications. -
The telephone is an electrical device for communicating verbally with another person who is not in the same physical location. -
A radio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another. -
It's an electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound. -
It's a wireless handheld device that can make or receive calls over a radio frequency carrier while the user is moving within a telephone service area. -
It's a mobile computing device that has a flat, rectangular form like that of a magazine or pad of paper, that is usually controlled by means of a touch screen, and that is typically used for accessing the Internet, watching videos, playing games, reading electronic books, etc.