In addition to the 3 previously mentioned user roles, there is the possibility for 2 other visitor types to your DSM organization:
Organization visitors.These are users on your InVision Enterprise account or InVision V7 team who do not have a seat in the DSM organization. They can view DSM organizations or design systems that are open to everyone at the organization.
Public visitors.These are visitors to your DSM site who have access to a public design system URL. These visitors can only see public design systems. They cannot access other parts of your DSM organization.