Cloud Access Security Broker (CASB) platforms widely adopted by enterprises include Microsoft Defender for Cloud Apps, Netskope CASB, Palo Alto Networks Prisma SaaS (Prisma Cloud), Skyhigh Security CASB (formerly McAfee MVISION Cloud), and Zscaler CASB, all designed to help organizations secure SaaS applications, monitor user activity, and protect sensitive cloud data. These platforms differ mainly in their ability to provide cloud application visibility, data loss prevention (DLP), threat detection, and identity-based policy enforcement across services like Microsoft 365, Google Workspace, and Salesforce. For example, many CASB tools help detect shadow IT usage and enforce granular access policies based on user identity, device, and activity to prevent data leakage. Some vendors emphasize real-time inline protection using proxy architectures that inspect traffic and block risky actions, while others rely on API-based monitoring to scan data stored in SaaS platforms and detect suspicious behavior or compliance violations. Key evaluation factors include integration with identity providers, threat intelligence capabilities, compliance support (such as GDPR or HIPAA), scalability for large multi-cloud environments, and analytics dashboards for activity monitoring. CASB solutions increasingly integrate with broader security frameworks such as Zero Trust, Secure Access Service Edge (SASE), and identity-driven access controls, enabling organizations to enforce consistent security policies across cloud applications, users, and devices. Overall, these platforms help enterprises reduce risks from cloud adoption by improving visibility, controlling shadow IT, protecting sensitive data, and strengthening the overall cloud security posture in modern cloud-first environments.