In the preceding screenshot, which shows the authentication methods, note that two methods cannot be disabled: Manual accounts and No login. These methods are always available to the site administrator.
Manual accounts enables the administrator to create user accounts. You used this method to create your test users.
Even if you are authenticating against an external database, you can still use this method to create users. For example, suppose your company or school uses Moodle and authenticates against your organization's IMAP email server. Since everyone at your organization has an email account, this ensures that your colleagues, and only your colleagues, have accounts in Moodle.
However, what if you ...
