Amplitude demodulation is a process used to extract the original information signal from a modulated carrier wave. In amplitude modulation (AM), the strength of the carrier wave varies in proportion to the information signal, such as audio or video. Demodulation involves detecting these variations to retrieve the original signal. The demodulation process typically uses a circuit called a demodulator, which can be found in devices like radios and televisions. By filtering and rectifying the received signal, the demodulator converts the varying amplitude back into a usable form, allowing us to hear music or see images transmitted over the airwaves.