website/content/en/docs/reference/glossary/replica-set.md

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ReplicaSet replica-set 2018-04-12 /docs/concepts/workloads/controllers/replicaset/ ReplicaSet ensures that a specified number of Pod replicas are running at one time
fundamental
core-object
workload

A ReplicaSet (aims to) maintain a set of replica Pods running at any given time.

Workload objects such as {{< glossary_tooltip term_id="deployment" >}} make use of ReplicaSets to ensure that the configured number of {{< glossary_tooltip term_id="pod" text="Pods" >}} are running in your cluster, based on the spec of that ReplicaSet.