A capacitor bank is a group of multiple capacitors connected together to store and release electrical energy. They are commonly used in electrical systems to improve power factor, which helps reduce energy losses and enhances the efficiency of power distribution. By providing reactive power, capacitor banks support the stability of the electrical grid and help maintain voltage levels. These banks can be found in various applications, including industrial plants and commercial buildings, where they help manage the demand for electricity. Capacitor banks are essential for optimizing the performance of electrical equipment and ensuring reliable operation in systems involving motors and transformers.