A pneumatic actuator is a device that converts compressed air into mechanical motion. It typically consists of a cylinder and a piston, where the air pressure pushes the piston to create linear or rotary movement. These actuators are commonly used in various applications, such as automation, robotics, and industrial machinery. Pneumatic actuators are favored for their speed and reliability. They can operate in harsh environments and are often used in systems requiring quick response times. Additionally, they are generally easier to maintain compared to other types of actuators, such as electric actuators or hydraulic actuators.