NIST SP 800-30 is a guide published by the National Institute of Standards and Technology that focuses on risk assessment for information systems. It provides a structured approach to identifying, evaluating, and prioritizing risks to help organizations protect their assets and ensure compliance with regulations. The document outlines a systematic process for conducting risk assessments, including steps such as risk identification, risk analysis, and risk response. By following these guidelines, organizations can better understand their vulnerabilities and implement effective security measures to mitigate potential threats.