A cloud access security broker (CASB), is cloud-delivered software or on-premises software and/or hardware that acts as an intermediary between users and cloud service providers. The ability of CASBs 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 security policies from their existing on-premises infrastructure to the cloud and create new policies for cloud-specific contexts.

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