HICAS, or High Capacity Actuator System, is a technology used in vehicles to enhance steering control. It allows for improved handling and stability, especially during high-speed maneuvers. By adjusting the rear wheels' angle in relation to the front wheels, HICAS helps drivers maintain better control and responsiveness. This system is commonly found in performance cars, such as those produced by Nissan. HICAS can provide benefits like reduced turning radius and increased cornering stability, making it a valuable feature for both everyday driving and competitive racing scenarios.