Frequency Modulation
By Frequency modulation (FM) is a method of modulating a radio frequency carrier wave by varying its frequency in response to a modulating signal.
In FM, the modulating signal is typically a low-frequency audio signal. The audio signal is used to vary the frequency of the carrier wave in a way that reflects the information being carried.
In contrast to amplitude modulation (AM), FM is less susceptible to noise and interference, and can provide higher-quality sound for a given signal-to-noise ratio. However, it also requires a wider bandwidth than AM, which can limit its usefulness in certain applications.