The key feature of namespaces is that they isolate processes from each other.
“Namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources.”
https://www.nginx.com/blog/what-are-namespaces-cgroups-how-do-they-work/
https://www.schutzwerk.com/en/43/posts/namespaces_05_kernel/