A Cloud access security broker, or CASB, is cloud-hosted software or on-premises software or hardware that act as an intermediary between users and cloud service providers. The ability of a CASB to address gaps in security extends across software-as-a-service (SaaS), platform-as-a-service (PaaS), and infrastructure-as-a-service (IaaS) environments. In addition to providing visibility, a CASB also allows organizations to extend the reach of their security policies from their existing on-premises infrastructure to the cloud and create new policies for cloud-specific context.

CASBs have become a vital part of enterprise security, allowing businesses to safely use the cloud while protecting sensitive corporate data.

Data Security for the Cloud Era