An analog amplifier is an electronic device that increases the amplitude of analog signals, which are continuous signals that vary over time. These amplifiers are commonly used in audio equipment, radios, and televisions to boost sound or signal strength without altering the original waveform. Analog amplifiers operate by taking a small input signal and producing a larger output signal. They can be classified into different types, such as operational amplifiers and class A, B, and C amplifiers, each with specific characteristics and applications. Their ability to handle continuous signals makes them essential in various electronic systems.