Many are familiar with Active Directory, the on-premises directory and authentication system that is available with Windows Server, but exactly what is Azure Active Directory?
Azure Active Directory (Azure AD or AAD) is a multi-tenant cloud directory and authentication service. Azure AD is the directory service that Office 365 (and Azure) leverages for account, groups, and roles. It is also an Identity Provider (IPD) and supports federation (SAML, etc).
Note: given how rap