Telecommunication is
the transmission of signals over a distance for the purpose of
communication. In modern times, this process almost always
involves the sending of electromagnetic waves by electronic
transmitters but in earlier years it may have involved the use of
smoke signals, drums or semaphore. Today, telecommunication is
widespread and devices that assist the process, such as the
television, radio and telephone, are common in many parts of the
world. There is also a vast array of networks that connect these
devices, including computer networks, public telephone networks,
radio networks and television networks. Computer communication
across the Internet, such as e-mail and instant messaging, is just
one of many examples of telecommunication.
