<ul><li>A ReplicationController (RC) ensures that a specified number of pod replicas are running at any given time.</li><li>A ReplicaSet (RS) is the next-gen version of RC, introduced with better support for label selectors.</li><li>The key difference between ReplicationController and ReplicaSet is that ReplicaSet supports set-based label selectors.</li><li>ReplicationControllers have been largely replaced by ReplicaSets and Deployments in modern Kubernetes environments.</li></ul>

Learning Kubernetes: ReplicationController vs ReplicaSet

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