A Class AB amplifier is a type of electronic amplifier that combines the features of Class A and Class B amplifiers. It operates by using two output transistors, one for the positive half of the signal and the other for the negative half. This design reduces distortion and improves efficiency compared to Class A amplifiers, while still providing better sound quality than Class B amplifiers. Class AB amplifiers are commonly used in audio applications, such as home theater systems and musical instrument amplifiers. They offer a good balance between sound fidelity and power efficiency, making them popular among audio enthusiasts and professionals alike.