Windows Identity Foundation (WIF) is a Microsoft software framework for building identity-aware applications. It provides APIs for building ASP.NET or WCF based security token services as well as tools for building claims-aware and federation capable applications.
It allows developers to build claims-aware applications by providing a set of application programming interfaces (APIs) that help developers write code to make access decisions to applications based on claims.
It provides templates to help developers get started building claims-aware applications.
It provides a set of ASP.NET controls that help developers create web pages for claims-aware applications.