A ReplicaSet in Kubernetes is used to ensure a specified number of pod replicas are running at any given time in the cluster. It automatically monitors the state of the pods and creates new ones if they crash or are deleted, maintaining the desired number. This increases the fault tolerance and scalability of the application.

Example: if a ReplicaSet is set with 3 replicas, Kubernetes will maintain exactly 3 running pods, automatically restoring them in case of failures.

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