Namespace
In plain terms
A logical partition isolating resources within a system.
Going deeper
A namespace scopes and isolates resources (and names) so different teams or apps don't collide, within a cluster or OS. It provides multi-tenancy and organization.
Under the hood
In Kubernetes it isolates workloads and quotas; in Linux, namespaces underpin container isolation.
Examples
Kubernetes namespaces, Linux namespaces, multi-team isolation, resource scoping.
Think of it like...
Like separate labeled drawers in a shared cabinet so items don't get mixed up.