What is Kubeadmin user in RHOCP?

Issue

Why Kubeadmin user does not appear in oc get users/rolebindings/identities?
How to change the password for Kubeadmin user?
What are the clusterrolebindings, clusterroles and groups used by Kubeadmin user?
Why does Kubeadmin user show Kube:admin while running oc whoami?
How OAuth or Kubernetes is able to authenticate Kubeadmin which is not defined in Identity provider and not visible as a User or Serviceaccount into Kubernetes?

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