Azure Active Directory
Azure Active Directory provides identity management and access control for your cloud applications. To simply user access to cloud applications, you can synchronize on-premises identities, and enable single sign-on. Azure Active Directory comes in 3 editions: Free, Basic, and Premium.
Azure Active Directory (Azure AD) is Microsoft’s multi-tenant cloud based directory and identity management service.
For IT Admins, Azure AD provides an affordable, easy to use solution to give employees and business partners single sign-on (SSO) access to thousands of cloud SaaS Applications like Office365, Salesforce.com, DropBox, and Concur.
For application developers, Azure AD lets you focus on building your application by making it fast and simple to integrate with a world class identity management solution used by millions of organizations around the world.