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content/en/docs/concepts/architecture/controller.md

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 title: Controllers
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 In robotics and automation, a _control loop_ is
 a non-terminating loop that regulates the state of a system.
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 {{< glossary_definition term_id="controller" length="short">}}
 
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 ## Controller pattern
 
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 or externally to Kubernetes. What fits best will depend on what that particular
 controller does.
 
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 * Read about the [Kubernetes control plane](/docs/concepts/#kubernetes-control-plane)
 * Discover some of the basic [Kubernetes objects](/docs/concepts/#kubernetes-objects)
 * Learn more about the [Kubernetes API](/docs/concepts/overview/kubernetes-api/)
 * If you want to write your own controller, see [Extension Patterns](/docs/concepts/extend-kubernetes/extend-cluster/#extension-patterns) in Extending Kubernetes.
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