Namespace
A virtual cluster within Kubernetes used to isolate and organize resources
A Namespace is a way to divide a single Kubernetes cluster into logical groups. Resources like Pods, Services, and ConfigMaps live inside a namespace, and names only need to be unique within one. This makes it easier to organize workloads by team, environment, or application without running separate clusters.
Kubernetes ships with a few built-in namespaces. default is where resources land if you don’t specify one. kube-system is reserved for cluster components like the API server and scheduler. kube-public holds publicly readable data, and kube-node-lease is used for node heartbeats.
Most resource types are namespace-scoped, meaning they exist within a namespace and are invisible from outside it. A few types like Nodes and ClusterRoles are cluster-scoped and exist globally across all namespaces.