A site is a area where you can share content and collaborate with other site
members.
Any user can create a site. The site creator becomes the Site Manager by default, though additional or alternate managers can be added after this.
Each site has a visibility setting that marks the site as public, moderated, or private. This setting controls who can see the site and how users become site members.
- Public site
- All users can view the content but only site members can work with the content.
- Any user can join the site.
- Moderated site
- All users can access the site but only site members can see and work with the content.
- Users must ask to join the site.
- Private site
- Only site members can access the site.
- Users must be added to the site by a site manager.
The manager of any site—whether public or private—can add users.
Note: The visibility setting of a site is displayed next to the site name when you're in the
site.
You can remove yourself from a site at any time by clicking 
in the site and selecting
Leave Site.