A parametric equalizer is an audio processing tool that allows users to adjust the frequency response of a sound signal. 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, making it useful in music production and live sound settings. Typically, a parametric equalizer features multiple bands, each with adjustable parameters. Users can boost or cut frequencies to shape the overall sound, correct issues, or create desired tonal qualities. This makes it a valuable tool for audio engineers and musicians alike.