Users with access to the Learning app and Learning management. 

There are 5 levels (roles) of admin users:

1. Reviewer: can review content drafts if invited by the author
2. Author: can create their own content and invite reviewers to review it
3. Content administrator: can create own content and access and manage content created by others
4. LMS administrator: access to all LMS functionalities related to content, learning and users
5. System administrator: full access to all LMS functionalities and client account settings

See: How do I grant Users the access to the Dashboard?