Windows Communication Foundation WCF is a framework for building and running service-oriented applications. WCF and its System.ServiceModel namespace that represents its primary programming interface, is the successor and unification of most distributed systems technologies used to build distributed applications
The current distributed systems technologies are .NET Remoting, Web Services, Web Service Enhancements (WSE), MSMQ, and Enterprise Services/COM+. WCF unifies all these into one programming model and you no longer have to make an exclusive explicit choice for one of these technologies. For example, with WCF you can build a Web Service with reliable communication that supports sessions and transaction flow and extend it to let you view the raw messages as they flow into the system.
Therefore, WCF offers a single programming model that unifies the features of .NET Remoting, MSMQ, Enterprise Services, Web Services and Web Service Enhancements
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