Can u ask some wat clear ?

web services are four pieces of infrastuctures. there are 
directories,discovery,discription,wire formats. 

     web service's attributes r WebMethod
(),WebServiceAttibute,WebServiceBinding. these are 
available in system.Web.Services namespaces

Web services are self-contained, modular applications that 
can be described, published, located, and invoked over a 
network. Web services could be weather reports or stock 
quotes. Transaction Web services, supporting business-to-
business (B2B) or business-to-client (B2C) operations.

The Web services architecture describes three roles: 
1.Service provider 
2.Service requester 
3.Service broker 
Web services components provide three basic operations: 
1.Publish 
2.Find 
3.Bind