We are a reseller and Tenable SC is one of the products that we implement for our clients.
The primary use case is to check for compliance against a specific framework, like NIST, CIS, or something similar. Tenable will check compliance on the assets against that specific framework and give that visibility to the technical staff, top management, and the risk management team. In turn, this will enable them to evaluate the risk that they are facing for non-compliance issues.
The second use case is helping the technical staff that handles updates and upgrades to the operating system. It means that they have the most urgent upgrades that they need to cover the high-risk vulnerabilities that can be found and exploited.
Beyond this, Tenable SC assists with malware detection and similar functionality.