According to the web search results, a cloud access security broker (CASB) is a software solution that stands between the cloud service provider and the cloud service user to enforce security controls. One of the most important benefits of using a CASB when migrating to a cloud environment is enhanced data governance, as it helps to protect sensitive information from unauthorized access, sharing, or loss. A CASB can also provide data classification, encryption, data loss prevention (DLP), and other features that enable organizations to manage and secure their data in the cloud.
References = What Is a Cloud Access Security Broker (CASB)?, A beginner's guide to cloud access security brokers