What is a pneumatic actuator?

By definition, a pneumatic actuator is a device that converts energy typically in the form of compressed air into mechanical motion. Within the industry, pneumatic actuators are recognized by several different names including pneumatic cylinders, air cylinders, and air actuators; all of which are one and the same.
Consisting of a piston, cylinder, and valves or ports, a pneumatic actuator can convert energy into rotary mechanical motions. This is dependent on whether the application is using a pneumatic rotary actuator.