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There are many open-[[Control loop|loop]] controls, such as on/off switching of valves, machinery, lights, motors or heaters, where the control result is known to be approximately sufficient under normal conditions without the need for feedback. The advantage of using open-loop control in these cases is the reduction in component count and complexity. However, an open-loop system cannot correct any errors that it makes or correct for outside disturbances, and cannot engage in [[machine learning]], unlike a [[closed-loop control system]].
==Open-loop and closed-loop (feedback)
[[File:Electromechanicaltimer.JPG|thumb|right|An electromechanical timer, normally used for open-loop control based purely on a timing sequence, with no feedback from the process.]]
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