SOAP or Simple Object Access Protocol is an XML-based protocol through which applications exchange information over HTTP. XML requests are sent by web services in SOAP format then a SOAP client sends a SOAP message to the server. The server responds back again with a SOAP message along with the requested service.
Web Services Description Language (WSDL) is an XML formatted language used by UDDI. “Web Services Description Language describes Web services and how to access them”.
