What does it mean to have tenancy on Navigator? What is sub-tenancy?

Tenancy setup at Navigator provides for isolation of content, identity, and data. Partners can choose to bring their content for their private use; and restrict access to data for users within the partner group. Tenancy setup ensures this isolation. In addition, tenancy will support customization of Navigator to the extent of usage of specific competency model, framework, etc; and access to additional tenant-level aggregate reports.
Sub-tenancy can be imagined as a controlled group within the tenant set up like a department requiring its own data isolation within the organization but access allowed to parent tenant users but not to peer departments. Sub-tenant, from a structure and setup perspective, is no different from a tenant.