Generic authentication options that are shared by all Auth plugins. Basically, determine whether users are enabled or not, guest user allowed or not, etc. Edited via the gui (Settings > Core options). Also provides the standard "auth" actions included by these plugins (login,logout).

You can select one or two Authentication plugin instances to provide auth backend to the application.
Default starter setup will typically use a unique SQL-based instance.
Default enterprise setup will often be composed of a Master / Slave configuration, Master being and LDAP or equivalent directory, slave being SQL-based to store the pydio-created users locally.