Report server web service (SSRS report/SOAP api)

Question

I have a requirement like this: I have to create Report server soap web service. I have googled so many things not even single clue i got about creating Report server web service. Can anyone explain me what is this ? What is Report server web service? how it differs from normal asp.net web services to Report server web service? I read some links. from those i just got basic understanding of report service web service. Report Server Web Service & Accessing the SOAP API &Report &Building Applications Using the Web Service and the .NET Framework so on. there is no proper example of how to create Report server soap web service.

 

How can i start creating report server web service in .net? and how to consume them?