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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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A system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals.
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A flat slab of stone, clay, or wood, used especially for an inscription.
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Television is a system of transmission of images and sound at a distance through Hertz waves.
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Radio is a means of communication that is based on the sending of audio signals through waves.
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An electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.
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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.
