Frequency modulation (FM) is a method of encoding information in a carrier wave by varying its frequency. In this technique, the amplitude remains constant while the frequency changes according to the input signal, such as audio or data. This allows for clearer transmission of signals over long distances, making FM popular in radio broadcasting. FM is widely used in radio communications, particularly for music and voice transmission. It provides better sound quality and resistance to noise compared to amplitude modulation (AM). Devices like FM radios and transmitters utilize this technology to deliver high-fidelity audio to listeners.