Telecommunication happens once the exchange of knowledge between communication participants includes the employment of technology. it's transmitted through a transmission medium, like over physical media, for instance, over transmission line, or via nonparticulate radiation through area like radio or light-weight. Such transmission ways area unit usually divided into communication channels that afford the benefits of multiplexing.  20th- and 21st-century technologies for long-distance communication sometimes involve electrical and magnetic force technologies, like telegraph, telephone, tv and serial printer, networks, radio, microwave transmission, optical fibre, and communications satellites. Early means that of act over a distance enclosed visual signals, like beacons, smoke signals, semaphore telegraphs, signal flags and optical heliographs. Telecommunication technologies could primarily be divided into wired and wireless ways. Overall although, a basic communication system consists of 3 main components that area unit perpetually gift in some type or another. Telecommunication over mounted lines is named point-to-point communication as a result of it's between one transmitter and one receiver. Telecommunication through radio broadcasts is named broadcast communication as a result of it's between one powerful transmitter and diverse low-power however sensitive radio receivers.