ABC is the three building blocks of WCF and they are known as
A - Address (Where): Address tells us where to find the services, like url
B - Bindings (How) : Bindings tells us how to find the services or using which protocols finds the services (SOAP, HTTP, TCT etc.)
C - Contacts (What): Contracts are an agreement between the consumer and the service providers that explains what parameters the service expects and what return values it gives.
Hope this will be very helpful to understand three building blocks of WCF, a very frequently asked interview questions.
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