Intercom is a system for communicating between a number of points that are close to each other. Intercom systems are used in offices, factories, and other places where quick, easy voice communication is needed. The electrical intercom is a simple type of telephone system. It consists chiefly of an amplifier and a number of loudspeakers placed at the communication points. The voice of the person speaking into a microphone at a central station is carried to the loudspeakers.
