What’s the relationship between Azure AD, Office 365, and Azure?
Azure AD provides you with common identity and access capabilities to all web services. Whether you are using Office 365, Microsoft Azure, Intune, or others, you're already using Azure AD to help turn on sign-on and access management for all these services.
Azure AD paid services like Enterprise Mobility + Security complement other web services like Office 365 and Microsoft Azure with comprehensive enterprise-scale management and security solutions.
Azure Active Directory (Azure AD) is Microsoft’s enterprise cloud-based identity and access management (IAM) solution. Azure AD is the backbone of the Office 365 system, and it can sync with on-premise Active Directory and provide authentication to other cloud-based systems via OAuth
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