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A user is any individual who accesses Confluence.
New users are created by a site administrator from the Administration Console.
A site administrator can also group users together into user-groups for more convenient administration. This means that any security permissions you assign at the site, space and page levels can be assigned for a whole group. A user in one of these groups will automatically be granted all permissions granted to the group as a whole.
There are two special groups in Confluence:
Confluence-Administrators - This is a 'super-group' and a user from this group has permission to do anything in the site, regardless of any other setting. Users in the confluence-administrators group are listed on the 'Contact Administrators' page that is linked from the footer throughout the site.
Confluence-Users - This is a 'default-group' of all new users. Permissions you assign to this group will be applied to all signed-up users of Confluence.
The anonymous user group
Confluence treats all users who do not log in when they access Confluence, as a member of the 'Anonymous' group. Any permissions assigned to this group will be assigned to all unidentified users of the system.