Final answer:
The purpose of the ISOO CUI registry is to manage controlled unclassified information (CUI) by categorizing, registering, and tracking it across government agencies.
Step-by-step explanation:
The purpose of the ISOO CUI registry is to manage controlled unclassified information (CUI). It is a system that helps to categorize, register, and track sensitive but unclassified information across various government agencies. The ISOO CUI registry ensures that this information is properly protected and shared with authorized individuals and agencies.