They are regular linux processes, you can find them in /proc or display them with ps... Croups, namespaces etc are Linux features that can be used with any proc

They are regular linux processes, you can find them in /proc or display them with ps... Croups, namespaces etc are Linux features that can be used with any process. But i guess i see now what you are saying. That it's a "meta" term for that idea of abstraction.