Signal demodulation is the process of extracting the original information from a modulated carrier wave. In communication systems, data is often transmitted by varying a carrier signal's amplitude, frequency, or phase. Demodulation reverses this process, allowing the receiver to retrieve the transmitted message. There are various techniques for demodulation, including amplitude demodulation, frequency demodulation, and phase demodulation. Each method is suited for different types of modulation used in systems like radio broadcasting or digital communication. Effective demodulation is crucial for ensuring accurate data transmission and reception.