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A computer is a computing device that is capable of receiving, storing and processing information in a useful way. -
A telegraph is any device or system that allows the transmission of information by coded signal over distance. -
A telephone is device that allows two or more users to have a conversation when they are too far apart to be heard directly. -
A radio is a means of communication that is based on the sending of audio signals through radio waves. -
A television is an electronic system of transmission of images and sounds at a distance by means of Hertzian waves. -
A tablet is a mobile computing device in which the touch screen occupies almost its entire size and in which there is no physical keyboard. -
A mobile phone is an electronic wireless device that allows access to the mobile phone network.