Definition
A Cloud Access Security Broker CASB is a software tool or service that acts as an intermediary between cloud service consumers and cloud service providers. It enforces security policies as data moves between on premises systems and the cloud, offering visibility and control over cloud application usage. CASBs help organizations maintain compliance and protect sensitive data by monitoring cloud activity, detecting threats, and preventing data loss. For instance, a CASB can prevent employees from uploading confidential customer lists to unauthorized cloud storage services. Unlike a traditional firewall that focuses on network perimeters, a CASB specifically addresses the security challenges introduced by cloud adoption. This topic is crucial for certifications like CompTIA Security+ and CISSP.