What is a CASB?

A Cloud Access Security Broker sits between your users and the cloud services they use, enforcing your security policies. It gives you visibility into which cloud and SaaS apps are being used (including unsanctioned ones), protects the data in them, detects threats like compromised accounts, and helps you meet compliance. Think of it as a security checkpoint and control layer for all your cloud usage, rather than something that only guards your own network.