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An actuator plays a crucial role in control systems by converting control signals into physical motion. It is a component that responds to a control signal, usually from a controller, to perform a specific action that manipulates or influences a physical system or process. For example, in a heating system, an actuator might control the position of a valve, adjusting the flow of heated water or steam based on the desired temperature set by the control system.

The function of an actuator is vital in many applications, as it enables automated processes to occur in a precise manner. While measuring the system's response, acting as a safety cut-off, or tracking system performance are important functions within a control system, these tasks are typically carried out by sensors, safety devices, or monitoring systems, rather than by actuators. The primary purpose of an actuator is to bring about a change in the physical state of a mechanism or system based on the received control signal, thereby facilitating the practical implementation of control commands.