There are three types of security groups to which users can belong:
- Global Groups: built-in site-wide groups which have configurable permissions for every project. "Site Users" is a global group.
- Site Groups: defined by an admin on a site-wide basis and have configurable permissions for every project.
- Project Groups: defined only for a particular project and the folders beneath it.
All users with accounts on LabKey belong to the Site Users group, a global group, by default. A user can belong to any number of additional project groups.