A Site can be shared with specific users, everyone on your school Apps domain, or with the world. At this time, it is only possible to apply sharing permission to the entire site, and not just pages within the site. 

There are different levels of permissions that Sites allows site owners to choose from. Those options are "Owners", "Collaborators", and Viewers". A brief overview of what the different aspects of sharing are:

Owners can:

• Invite other owners, collaborators, and viewers
• Change site themes, and layout
• Change the site name
• Delete the site
• Do everything a collaborator can do
• Change any page within the site

Collaborators can:

• Create, edit, delete pages
• Move pages
• Add attachments
• Add comments
• Add/remove pages to the sidebar navigation
• Subscribe to site and page changes
• Change any page within the site

Viewers can:

• Only view pages (all pages within the site)

You can invite specific individuals to be editors or viewers. You can also invite everyone with an account on the domain to be an editor or a viewer.

You can also make a site public to view (no sign in or school Apps account required).

Please note: Your school apps domain administrator may have restricted whether you can share your site outside your school apps domain with the public or with users who do not have a school apps account.