A Cloud Access Security Broker (CASB) is a security solution that acts as an intermediary between an organization’s on-premises infrastructure and cloud services. It monitors and controls data flow to ensure security, compliance, and governance. CASBs enforce corporate policies by managing user access to cloud applications and preventing unauthorized data transfers.
Initially, CASBs functioned like firewalls, using proxy servers to direct all cloud traffic and enforce security rules. Today, they have evolved to use an API-driven approach, integrating directly with major SaaS applications. This modern method provides detailed control and visibility into user activities and data, enhancing the security and compliance of cloud environments. CASBs are crucial for safeguarding sensitive information and maintaining compliance across SaaS, IaaS, and PaaS platforms.