Windows Communication Foundation (WCF) is a framework developed by Microsoft for building service-oriented applications. It allows developers to create secure, reliable, and interoperable services that can communicate across different platforms and protocols. WCF supports various communication methods, including HTTP, TCP, and MSMQ, making it versatile for different application needs. WCF simplifies the process of connecting applications by providing a unified programming model. It enables developers to define service contracts, data contracts, and message contracts, ensuring that data is transmitted accurately. This framework is particularly useful for enterprise applications that require robust communication between distributed systems.