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Broadcast communications, otherwise known as telecom, is the exchange of data through electronic means over vast separations and alludes to a broad spectrum of speech, text, and video transmission. This is an descriptive concept that encompasses a vast variety of developments in the delivery of data, such as phones (wired and remote), microwave interchanges, fibre networks, satellites, radio and television broadcasting, the internet and broadcasts. A complete, single media transmission circuit involves two stations each fitted with a transmitter and a receiver. Sign transmitting vehicle may be by electrical wire or link (otherwise named "copper"), optical fibre, electromagnetic fields, or illumination. The free space transfer and knowledge processing through electromagnetic field techniques is called remote communication.