Microsoft Cloud App Security only comes in the E5 formula of Microsoft EMS. It is a Cloud Access Security Broker (CASB) that gives you insight into the use of cloud apps and services, which quickly reveals a lot of 'shadow IT'. (unapproved soft- and hardware that falls outside the IT department).
It provides advanced analytics to prevent cyber threats and allows you to control how your data is accessed and sent. Manage and restrict access based on session context such as identity, device and location and immediately detect abnormal behavior.