A Class D Amplifier is a type of audio amplifier that uses pulse-width modulation to convert an audio signal into a series of on-off pulses. This method allows the amplifier to operate more efficiently than traditional amplifiers, as it generates less heat and consumes less power. Class D amplifiers are commonly used in applications where space and energy efficiency are important, such as in portable speakers and home theater systems. These amplifiers can deliver high output power while maintaining sound quality, making them popular among audio enthusiasts. They are often found in subwoofers and car audio systems, where powerful bass response is desired. Overall, Class D amplifiers provide a compact and efficient solution for amplifying audio signals.