What is wave amplitude modulation used for in communication?

Wave amplitude modulation is a technique used in communication to vary the amplitude of a carrier wave in accordance with the information signal being sent. This modulation allows the information (such as audio or video) to be encoded onto the carrier wave by changing its amplitude, enabling effective transmission over distances.

When the amplitude of the carrier wave is increased or decreased, it creates variations that can be interpreted as different values of the information signal. This process allows for the transmission of signals that can be demodulated back into the original information by the receiver.

The correct answer reflects the fundamental principle of how amplitude modulation works in encoding information for communication purposes, making it central to understanding radio broadcasts and other forms of amplitude-modulated communications.