The Web Services Description Language (WSDL, pronounced 'wiz-dəl' or spelled out, 'W-S-D-L') is an XML-based language that provides a model for describing the functions of Web services.
For example, a banking Web service may implement functions to:
These functions are described in a WSDL file that any consumer can invoke to access the banking Web service.
A WSDL file is a public contract that specifies: