-
TELEGRAPH
a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection -
TELEPHONE
telephone is a system used to send speech or data over distances using a device called a telephone that functions as the transmitter and receiver -
RADIO
the transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages. -
TELEVISION
a system for converting visual images, into electrical signals, transmitting them by radio or other means, and displaying them electronically on a screen. -
COMPUTER
an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program. -
TABLET
is a portable computer that uses a touchscreen as its primary input device -
mobile phone
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.
