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The computer is and electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program. -
Telegraph was a system that trasmited messages through a wire, one of the system was breaking the connection of wires or making signals. -
The telephone is a system for transmiting the voices over any distance using a wire or using a radio, it converts acoustic vibrations into electrical signals. -
The radio made the transmission and reception of electromagnetic waves of the frequency of radios. Especially the ones that carry sound messages. -
The television is a system of converting visual images with sound, into electrical signals, transmiting them by radios and other means.
This means display them electronically in the screen. -
The tablet is a wireless and portable personal computer with a touchscreen interface. This is smaller than a notebook but larger than a smartphone. -
It's a portable device that can make calls or recive calls through a radio frequency carrier.