Frequency demodulation is a process used to extract information from a modulated signal, where the information is encoded in variations of frequency. This technique is commonly applied in communication systems, such as radio broadcasting, where audio signals are transmitted over radio waves by changing their frequency. In frequency demodulation, the receiver detects these frequency changes and converts them back into the original audio or data signal. This method is essential for ensuring clear and accurate transmission of information, making it a fundamental aspect of technologies like FM radio and television broadcasting.