Webmin's user management features are quite sophisticated. You can use Webmin to manage users and groups on your system, decide which of them have access to Webmin, and which modules they will be allowed to see. You can also create special Webmin-only users, who will not have regular accounts on your system, but will still be able to access selected Webmin modules.

If you're the main administrator of a system, you can set up Webmin to allow other administrators to modify only selected parts of your system's configuration. For instance, you can allow sub-administrators to configure the Apache web server but not to change other settings. This particular workflow is so common, in fact, that a sibling product to Webmin called Usermin was developed to allow non-administrators access to a Webmin-like environment through which they can access databases, configure web hosts, set up cron jobs, and read local mail.