Wireless Communication

Communication is the transfer of information from one device to another. Modern communication systems involve man-made signals that can be transmitted to different places. The communication signals that carry the information can be in the form of electrical energy, such as currents and voltages, electromagnetic energy, optical energy, or sonic energy. Signals are generated electronically and transmitted via cables and wired lines or wirelessly through electromagnetic radiation in space in the form of radio waves or microwave energy. Signals can also be transmitted by optical or sonic methods.