Reactive power is a concept in electrical engineering that refers to the power that oscillates between the source and the load in an alternating current (AC) system. Unlike active power, which performs useful work, reactive power does not contribute to energy consumption but is essential for maintaining voltage levels in the system. It is measured in volt-amperes reactive (VAR). In many electrical devices, such as motors and transformers, reactive power is necessary for their operation. It helps create magnetic fields that enable these devices to function properly. Managing reactive power is crucial for the efficiency and stability of power systems, ensuring that electricity is delivered effectively to consumers.