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Telegraph is a system of sending messages over long distances, either by means of electricity or by radio signals. Telegraph was used more often before the invention of telephones and computers.
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The telephone is the electrical system of communication that you use to talk directly to someone else in a different place. You use the telephone by dialling a number on a piece of equipment and speaking into it.
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Radio is the broadcasting of programmes for the public to listen to, by sending out signals from a transmitter.
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A television is a piece of electrical equipment consisting of a box with a glass screen on it on which you can watch programmes with pictures and sounds.
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A computer is an electronic machine that can store and deal with large amounts of information.
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A tablet is a small flat computer that you operate by touching the screen.
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A mobile phone is a phone that you can carry with you and use to make or receive calls wherever you are.
