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a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection.
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The telephone it's a device that allowed multiple messages to be transmitted over a wire at the same time.
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Radio is the technology of signaling and communicating using radio waves.
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An electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound.
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The computer is a programmable electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations.
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A mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
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A tablet is a touch screen device that resembles a very large smartphone. Tablets can access the internet and act in many ways like a laptop.
