___________ is a collection of Google applications and APIs that help support functionality across devices and a requirement for Android Enterprise.

Google Mobile Services (GMS) is a suite of proprietary Google applications and APIs that are essential for many Android functionalities, including those leveraged by Android Enterprise. Devices must pass Google's compatibility tests to license and pre-install GMS. Without GMS, devices lack core Google apps like the Play Store, Gmail, and Google Maps, and critical APIs for device management. Android Managed Services (AMS) is not a standard Google term. Android Compatibility Services (ACS) is not a recognized Google suite. The Compatibility Test Suite (CTS) is a set of tests used to ensure Android device compatibility, but it is a testing tool, not a collection of applications and APIs itself.