Class D amplifiers are a type of audio amplifier that use a method called pulse-width modulation to convert audio signals into a series of on-off pulses. This allows them to operate more efficiently than traditional amplifiers, as they generate less heat and can deliver more power to speakers without requiring large heatsinks. These amplifiers are commonly used in various applications, including home audio systems, car audio, and professional sound equipment. Their compact size and high efficiency make them ideal for portable devices and situations where space is limited, while still providing high-quality sound output.