<p>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.</p><p>Default on:</p><ul><li>Joomla</li></ul><p>Default off:</p><ul><li>Gmail</li><li>LDAP</li></ul>