A Notch Filter is a type of electronic filter designed to eliminate a specific frequency from a signal while allowing all other frequencies to pass through. This is particularly useful in audio processing, where unwanted noise or interference at a certain frequency can disrupt sound quality. By targeting and removing this frequency, the notch filter helps to clean up the audio signal. In practical applications, notch filters are often used in music production and telecommunications to improve clarity. For example, they can effectively reduce the hum from electrical equipment, ensuring that the desired audio or data remains clear and undistorted.