Frequency Division Multiplexing (FDM) is a technique used to transmit multiple signals over a single communication channel. It works by dividing the available bandwidth into distinct frequency bands, each assigned to a different signal. This allows multiple data streams to be sent simultaneously without interference, making efficient use of the available spectrum. In FDM, each signal is modulated to occupy its own frequency range. For example, in television broadcasting, different channels are transmitted at different frequencies, allowing viewers to receive multiple channels without cross-talk. This method is widely used in various applications, including radio transmission and telephone networks.