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A computer is a machine or device that performs processes, calculations and operations based on instructions provided by a software or hardware program -
A telegraph is a system to send messages along a wire. -
A telephone is a device that allow two or more people talk at any distance. -
The radio is a communication way that sends audio signals through radio waves -
The TV is an image and sound transmision system at any distance trough hertzian waves. -
A tablet is a wireless portable personal computer with a touch screen. it is usually smaller than a laptop, but larger than a smartphone. -
A mobile phone is a wireless portable device that allows users to make and receive calls.