Address : An address that indicates where to find the service.
Binding : A binding that specifies how a client can communicate with the service.
Contract : A Contract that specifies what can the service do for us.
So without this ABC WCF wont work and this are consider to be an Endpoints.
An Endpoint is a piece of information that tells WCF how to build the runtime communication channels to send and receive messages. An endpoint consists of the three things address, binding and contract.
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