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A computer is an electronic device used to store and process data, typically in binary form. -
A 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 telephone is a telecommunication device that is used for the transmission of messages by the voice. -
A radio is a device that receives and transmits electromagnetic waves. -
A television is a system used to transmit visual images and sound that are reproduced on screens. -
A mobile phone is a telephone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network. -
A tablet is a small portable computer that accepts input directly on to its screen rather than by a keyboard or mouse.