Azure Active Directory (Azure AD) is Microsoft’s multi-tenant, cloud-based directory, and identity management service that combines core directory services, application access management, and identity protection into a single solution. Azure AD also offers a rich, standards-based platform that enables developers to deliver access control to their applications, based on centralized policy and rules.
Azure AD supports the SAML 2.0, openID Connect 1.0, OAuth 2.0, and wS-Federation 12 authentication protocols.