Amplitude modulation (AM) is a method of transmitting information by varying the amplitude (or strength) of a carrier wave in proportion to the input signal, such as audio or data. In AM, the frequency of the carrier wave remains constant, but its amplitude changes based on the instantaneous value of the modulating signal. In practical terms, this means that the "height" of the carrier wave's oscillations increases or decreases as the input signal fluctuates. AM is commonly used in AM radio broadcasting, where the audio signal (like speech or music) modulates the amplitude of the radio carrier wave to transmit sound. AM is generally more susceptible to noise and interference than other modulation techniques, such as frequency modulation (FM), because noise typically affects amplitude more directly. [ChatGPT.com (2024)]