+An **actuator** is a device that transforms a form of [energy](/wiki/energy) into mechanical [motion](/wiki/motion). It serves as the "muscle" of a system, enabling precise control and movement in applications ranging from simple valves to complex robotics.
+## See also
+- [Sensor](/wiki/sensor)
+- [Motor](/wiki/motor)
+- [Control System](/wiki/control_system)
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