Do related Namespaces in Kubernetes necessarily interact with each other?

In Kubernetes, Namespaces are used for logical separation of resources within a single cluster. Related or different Namespaces are isolated from each other by default, and resources in one Namespace do not directly interact with resources in another.

However, interaction is possible if appropriate permissions and network policies are configured. For example, services from different Namespaces can communicate with each other through services (Service) and DNS if permitted.

Thus, related Namespaces do not necessarily have to interact, but communication between them can be configured if needed.