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Feedback in audio systems is commonly understood as a loop of sound that occurs when a microphone picks up sound from a speaker that it is amplified through, creating a continuous cycle. This typically results in an unpleasant high-pitched noise, often referred to as "squealing." The phenomenon occurs when the amplified sound from the microphone is fed back into the sound system, leading to an increase in volume and resonance that can reach a debilitating level if not controlled or managed properly.

This high-pitched noise is not only problematic for the listening experience but can also indicate issues with sound system placement and microphone sensitivity levels. Proper system design and management techniques aim to minimize or eliminate feedback to ensure clear and pleasant audio reproduction. Understanding feedback is crucial for anyone working with audio systems to prevent interference and maintain audio quality.