Site Membership
Site members can be assigned roles that define site-level privileges. This gives them more permissions than guests, allowing them to collaborate through widgets like message boards and wikis.
Site roles apply only to the site where they’re assigned. Site administrators can’t create roles but can manage permissions through teams, which are groups of users with defined access. See Creating Teams for more information.
You can add or invite users to your site. Membership type controls how users join. See Changing Site Membership Type for details.
You can also set default roles and teams for new members. See Configuring Role and Team Defaults for Site Members.