.SVC File Extension

Text file that contains information about a Windows Communication Foundation (WCF) service that can be run using Microsoft Internet Information Services (IIS); includes a WCF-specific processing directive that activates hosted services in response to incoming messages.

The syntax of an SVC file may look something like this:
<% @ServiceHost Service="Namespace.ServiceTypeName" %>

The address of an SVC file is typically "http://localhost/Application1/MyService.svc."