What is Active Directory Federation Services?
Active Directory Federation Services (AD FS) is a feature introduced with Windows Server 2003 R2 that provides an identity access solution. It gives browser-based clients, which are inside or outside your network, Single-Sign-On (SSO) access to web-based applications. It is important to note that AD FS only works for web-based applications. AD FS can be used in web hosting or SharePoint environments. It is very useful when a company has web servers located in a DMZ or at a remote hosting vendor or business partner and wants to control account credentials to their web applications from the internal Active Directory.
