The term "Equalizer" can refer to various concepts, but it is commonly associated with audio technology. In this context, an equalizer is a device or software that adjusts the balance between frequency components of an audio signal. By boosting or cutting specific frequencies, users can enhance sound quality and tailor audio output to their preferences. In a different context, "Equalizer" may refer to the popular action film series starring Denzel Washington. The films follow the character Robert McCall, a former intelligence operative who uses his skills to help those in need, often seeking justice for the oppressed. The series combines elements of drama and action, showcasing themes of redemption and moral complexity.