http://www.youtube.com/watch?v=mKjvKPlb1rA

SOAP Web Services 01 - Introduction To Web Services

0. terminology

WSDL:　 Web Services Description Language

　　in XML format

UDDI: 　Universal Description Discovery and Integration

　　 is a directory service where businesses can register and search for Web services.

SOAP: Simple Object Access protocol

SEI:　　Service Endpoint Interface

web service c#