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What is it? It's a long distance transmission of written messages without the physical transport of letters, originally over wires. Radio telegraphy or wireless telegraphy transmits messages using radio. -
What is it? A telephone is a system or device for transmiting voices over a distance by using a wire or a radio. -
What is it? Its the transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages. -
What is it? It's a long-distance transmission of written messages without the physical transport of letters, originally over wires. Radio telegraphy or wireless telegraphy transmits messages using radio. -
What is it? It's a device that accepts information (in the form of digitalized data) and manipulates it for some result based on a program, software, or sequence of instructions on how the data is to be processed. -
What is it? It's 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 wireless, portable personal computer with a touchscreen interface.