A rotary actuator is a device that converts energy into rotational motion. It is commonly used in various applications, such as robotics, industrial machinery, and automotive systems. Rotary actuators can be powered by different sources, including electric motors, hydraulic systems, or pneumatic pressure, allowing them to perform tasks like opening valves or moving robotic arms. These actuators come in various types, including servo motors, stepper motors, and pneumatic actuators, each designed for specific functions and precision levels. Their ability to provide controlled rotation makes them essential components in automation and control systems, enhancing efficiency and performance in many industries.