Android Enterprise is a set of tools and services provided by Google as an enterprise management solution for Android devices.

When you integrate Endpoint Management with managed Google Play to use Android Enterprise, you create an enterprise. Google defines an enterprise as binding between the organization and your enterprise mobile management (EMM) solution. All the users and devices that the organization manages through your solution belong to its enterprise.

Please click on this link for additional details: Click Here 

Please follow this link on how to migrate from Device Admin Mode to Android Enterprise: Click Here