What is the difference between NIST SP 800-53 and NIST SP 800-53A?

What is the difference between NIST SP 800-53 and NIST SP 800-53A?

NIST SP 800-53: NIST SP 800-53 is a set of security and privacy controls developed by the National Institute of Standards and Technology (NIST) to help organizations protect their information systems and data. It provides organizations with a framework for assessing and managing their cybersecurity risks. This framework is based on the Cybersecurity Framework (CSF), which is a risk-based approach to cybersecurity. The NIST SP 800-53 provides a set of security and privacy controls that organizations can use to protect their information systems and data.

NIST SP 800-53A: NIST SP 800-53A is an extension of the NIST SP 800-53 that provides additional guidance on the conducting assessment of these controls. It provides additional guidance on how to assess the security and privacy controls in NIST SP 800-53. It also provides guidance on how to develop and implement a risk assessment program. This additional guidance makes it easier for organizations to assess the security and privacy controls in NIST SP 800-53, and to develop and implement a risk assessment program.