Often times when customers want to stand up a Cloud Service, they need to integrate their existing identity directories to protect access and use of those cloud apps and data. After all, identity is the new key to security. Without the proper identity access controls you are rolling the dice with security vulnerability.
Several years ago, I began helping Microsoft customers cross this bridge of hybrid identity implementations using Azure Active Directory as the pivot point to smooth cloud deployments with security confidence and immediate productive use.
Attached is a deck I use to educate customers on Azure AD. Feel free to use and share. If you have questions feel free to email me at Kevin@RTriad.com
Also visit Microsoft Azure's resource page https://azure.microsoft.com/en-us/services/active-directory/