Once the full extent of cloud usage is revealed, the CASB then determines the risk level associated with each by determining what the application is, what sort of data is within the app, and how it is being shared. https://www.mcafee.com/enterprise/en-au/security-awareness/cloud/what-is-a-casb.html A cloud access security broker (CASB) (sometimes pronounced cas-bee) is on-premises or cloud based software that sits between cloud service users and cloud applications, and monitors all activity and enforces security policies.[1] A CASB can offer a variety of services such as monitoring user activity, warning administrators about potentially hazardous actions, enforcing security policy compliance, and automatically preventing malware. https://en.wikipedia.org/wiki/Cloud_access_security_broker