Literally speaking, Replica is an exact copy of something. In Kubernetes it is no different, Replica is a copy of a pod, which must be maintained by a ReplicaSet to offer high availability of pods at any given instant.
If you are interested in learning more about Kubernetes, watch the following video on Fleet Management for Kubernetes, and if you wish to learn Kubernetes and get certified, enroll in a good Kubernetes training course from Intellipaat.
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