Superjunction MOSFET, commonly known by the brand name "CoolMOS," is a type of power MOSFET that's designed to achieve high efficiency and low energy loss in high-voltage applications. It's a specialized variant of the Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) designed for power conversion and switching applications. CoolMOS technology is often used in power supplies, motor drives, lighting systems, and other high-power electronic devices.