Pulse Code Modulation (PCM) is a method used to digitally represent analog signals. It works by sampling the amplitude of an analog signal at regular intervals and converting these samples into a series of coded pulses. Each pulse corresponds to a specific amplitude level, allowing the original signal to be reconstructed accurately. PCM is widely used in various applications, including audio recording, telecommunications, and digital broadcasting. By converting sound waves into a digital format, PCM enables efficient storage and transmission of audio data, ensuring high-quality sound reproduction while minimizing noise and distortion.