Windows Communication Foundation (WCF) follows a client–server model to establish communication between applications. It simplifies the development effort to make service oriented applications by combining the technologies together, leading to higher development productivity. The WCF framework builds loosely-coupled applications on a service oriented architecture that inter-operates more securely and reliably across platforms.
On other way WCF is the extended version of the Web services. Microsoft has released a patch after web services i.e Web services Enhancement( WSE ) which includes the security, encoding, asynchronous pattern for web services. So WCF is the mixture of Web service+WSE+Remoting feature having securitry,enconding,compression, trancsaction,concurrency and reliability in one package.
WCF unifies the capabilities into single , common, general service oriented programming model for Communication. It provides a common approach using a common API which developers can focus on their application rather than on communication protocol.
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