A Namespace provides a scope for names and policies inside a Kubernetes cluster. The Namespace YAML Generator writes that manifest from a form so you do not have to recall the core/v1 schema.
You set the Namespace name - the only required field - and optionally add labels. The resulting YAML is valid core/v1 and is ready to apply with kubectl.
The name is validated as an RFC 1123 label. Problems are reported in a clear panel. Everything runs locally and nothing is uploaded.