Demodulation is the process of extracting the original information from a modulated signal. In communication systems, information such as audio or video is often converted into a form suitable for transmission over various media. This involves altering the signal's properties, like its amplitude or frequency, to carry the information effectively. At the receiving end, demodulation reverses this process, allowing the original data to be retrieved. Devices like radio receivers and television sets use demodulation to convert the received signals back into a format that can be understood by humans, ensuring clear communication and media playback.