 The information produced by the receiver may be in the form of sound (an audio signal), images (a video signal) or digital data.Wired communications make use of underground communications cables (less often, overhead lines), electronic signal amplifiers (repeaters) inserted into connecting cables at specified points, and terminal apparatus of various types, depending on the type of wired communications used.Wireless communication involves the transmission of information over a distance without help of wires, cables or any other forms of electrical conductors.