...
Site Admin: Has the ability to access and change global settings and configurations. Can create and edit all forms of content, manage users, create certificates, and review global and store reports.
Course Admin: Can create courses and pages. Can edit any course or page. Course Admins can review reports and manage user enrollments at the course level.
Course Author: Can create courses. Can only edit their own courses. Course authors can review reports and manage user enrollments at the course level for their own courses. To assign a Course Author to a course, please see the Authoring information tab information
Report Viewer: Can view various administrative reports.
Reviewer: Can review unpublished courses. Cannot modify or create content.
Support: Can add/edit view enrollments, orders, users, user profiles, users certificates, and masquerade. Cannot modify or create content.
Web service: Allows access to EthosCE web service API. For service accounts only.
Authenticated User: Authenticated user is the default role in the system, and allows the user with this role to access content that they would otherwise need to be logged in to see.
...