An equalizer is a tool used in audio processing to adjust the balance of different frequency ranges in sound. By boosting or cutting specific frequencies, it helps enhance the overall audio quality, making music or speech clearer and more enjoyable. Equalizers are commonly found in music production software, home audio systems, and even in smartphones. In the context of music, an equalizer can help tailor the sound to fit different genres or personal preferences. For example, a graphic equalizer displays frequency bands visually, allowing users to see how their adjustments affect the sound. This makes it easier to create the perfect listening experience.