Admins can view and edit things at an org-wide level for your practice and will have all permissions across the platform including viewing, adding, and editing patients, creating and editing cases, uploading scans, adding and managing team members and their permissions, within the platform, and editing practice-level settings.
If a team member is assigned with just the "Team" role, then they will not be able to perform org-wide functions or settings, but can still manage patients, cases, and upload scans.