Active Directory Authentication Library for .NET (ADAL.NET) is an easy to use authentication library. You can use ADAL.NET to acquire security tokens to access protected Web APIs, for instance Microsoft Graph, or another Web APIs. ADAL.NET is available on various .NET Desktop/Mobile platforms to acquire a token for the signed-in user ( Windows desktop, UWP, Windows 8.1, Xamarin iOS and Xamarin Android). It can also be used in Web applications and Web APIs (ASP.NET, .NET Core, ASP.NET Core) that call other Web APIs in the name of a user, or without a user. ADAL.NET takes advantage of Windows Server Active Directory and Windows Azure Active Directory. dev: Contains newest development of both ADAL (v4+) and MSAL (v2+). This is where all current and future development of ADAL and MSAL takes place. adalV3/dev : Holds the v3 branch. Only security fixes will make it to v3.