Because when creating Kubernetes' new cluster, it has initial namespaces that help different projects, teams, or customers to share its Kubernetes cluster. The namespace for objects created by the Kubernetes system is called ‘kube-system’ which part of this core component is ‘kube-apiserver’ that exposes the Kubernetes HTTP API. Also, subdividing cluster namespaces, by default it will instantiate a ‘default’ namespace when provisioning the cluster to hold the default set of Pods, Services, and Deployments used by the cluster.