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The telegraph is a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection. -
A computer is an electronic device that manipulates information, or data. -
The telephone is a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals. -
A radio is sound communication by radio waves, usually through the transmission of music, news, and other types of programs. -
The television is an electrical device that receives and reproduces these images and sounds. -
A tablet is a wireless, portable personal computer with a touchscreen interface. -
A mobile phone is a wireless handheld device that allows users to make and receive calls.