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 binary numbers. This process allows for the accurate reproduction of the original signal when it is played back. PCM is widely used in various applications, including audio recording, telecommunications, and digital broadcasting. By converting sound waves into a digital format, PCM enables high-quality audio transmission and storage, making it a fundamental technology in modern digital media.