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Telegraph
The telegraph is a system for sending messages from a distance along a wire. This is using a Morse code. -
Telephone
The telephone is a system for transmitting voices over a distance using wire or radios. -
Radio
The send and receiving of electromagnetic waves of radio frequency, especially those carrying sound messages. -
Television
The television is a system for converting visual images into electrical signals, sending them by radio, and displaying them electronically on a screen. -
Computer
The computer is a electronic device for storing and processing data, typically in binary form. -
Internet
The internet is a global computer network providing a variety of information and communication apps.