Azure Active Directory Domain Services provide scalable, high-performance, managed domain services such as domain-join, LDAP, Kerberos, Windows Integrated Authentication, and Group Policies. With the click of a button, administrators can enable managed domain services for virtual machines and directory-aware applications deployed in Azure Infrastructure Services.
By maintaining compatibility with Windows Server Active Directory, Azure Active Directory Domain Services give you an easy way to migrate traditional on-premises applications to the cloud. Azure Active Directory is now the single managed directory for both modern SaaS and traditional directory-aware apps.