Short Answer 
Controlled Unclassified Information (CUI) requires specific safeguarding and dissemination controls despite not being classified. The Department of Defense (DoD) has a CUI Registry that defines how this information should be managed, distinguishing it from general unclassified information, which does not have the same handling requirements.
Step 1: Understand the Definition of CUI
Controlled Unclassified Information (CUI) is information that, while not classified, still requires specific safeguarding and dissemination controls. This information is sensitive enough that it must be protected from unauthorized access, making it crucial for various government functions.
Step 2: Recognize the DoD CUI Registry
The Department of Defense (DoD) has developed a CUI Registry that clearly defines how this information must be categorized and managed. This registry outlines the requirements for protecting CUI, ensuring consistency and clarity in handling sensitive information across federal agencies.
Step 3: Distinguish CUI from General Unclassified Information
It is important to note that CUI is distinct from general unclassified information. While general unclassified data may not require special handling, CUI is subject to specific restrictions and requirements to prevent unauthorized disclosure. Misunderstanding this distinction can lead to improper management of sensitive information.