Namespaces in Kubernetes create virtual clusters inside the physical cluster, providing logical boundaries and isolating resources.
Namespaces allow teams/projects to use the same cluster without interfering with each other, group resources logically, and manage permissions and access controls.
Namespaces are applied to namespaced objects like Pods, Services, configMaps & Secrets, and can set CPU & Memory limits.
Default Namespaces in Kubernetes include Default, Kube-system, Kube-public, and Kube-node-lease, each serving specific functions within the cluster.