The authentication plugins operate when users login to your site or administrator. The Joomla! authentication is in operation by default but you can enable Gmail or LDAP or install a plugin for a different system. An example is included that may be used to create a new authentication plugin.
If this is your first Joomla site or your first web site, you have come to the right place. Joomla will help you get your website up and running quickly and easily.
Start off using your site by logging in using the administrator account you created when you installed Joomla!.