Audio amplification is the process of increasing the power of an audio signal to make sound louder. This is commonly achieved using devices called amplifiers, which take a weak audio signal and boost it to a level suitable for driving speakers. Amplifiers are essential in various audio systems, including home theaters, public address systems, and musical performances. The main components of an audio amplifier include the input stage, where the audio signal enters, and the output stage, which sends the amplified signal to the speakers. Different types of amplifiers, such as class A, class B, and class D, have unique characteristics that affect sound quality and efficiency.