website/content/en/docs/reference/glossary/cluster.md

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Cluster cluster 2019-06-15 A set of worker machines, called nodes, that run containerized applications. Every cluster has at least one worker node.
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A set of worker machines, called {{< glossary_tooltip text="nodes" term_id="node" >}}, that run containerized applications. Every cluster has at least one worker node.

The worker node(s) host the {{< glossary_tooltip text="Pods" term_id="pod" >}} that are the components of the application workload. The {{< glossary_tooltip text="control plane" term_id="control-plane" >}} manages the worker nodes and the Pods in the cluster. In production environments, the control plane usually runs across multiple computers and a cluster usually runs multiple nodes, providing fault-tolerance and high availability.