A parametric equalizer is an audio processing tool that allows users to adjust the frequency response of a sound. It provides control over specific frequency bands, enabling adjustments to the gain, bandwidth, and center frequency. This flexibility helps in enhancing or reducing certain sounds in music or audio recordings. By using a parametric equalizer, sound engineers can fine-tune audio to achieve a desired tonal balance. It is commonly used in music production, live sound reinforcement, and broadcasting. The ability to target specific frequencies makes it a valuable tool for improving overall sound quality and clarity.