Hosting a service is an important part of any service. Coming from web services, WCF exposes more relevant APIs to handle different kinds of hosting environments. A WCF service can be hosted virtually anywhere, starting from a simple Console Application, a Windows Service, IIS, or even other hosting services such as Windows Activation Service. After the service is hosted on an environment, the service endpoint for a particular service gets exposed. When the host process runs, WCF will be available using the configured endpoints.

Any .NET application runs using a Windows process. Inside a process, you can host multiple .NET application domains. Each application domain logically separates the execution environment from another. WCF requires ServiceHost to host a worker process inside the application domain. Similarly, each application domain can host multiple worker processes. Each application represents service host-to-host multiple endpoints...