WSDL (Web Services Description Language) is an XML-based language for describing Web services and how to access them. It is a document written in XML. The document describes a Web service. It specifies the location of the service and the operations (or methods) the service exposes.
About WSDL (Web Services Description Language)
WSDL stands for Web Services Description Language
WSDL is written in XML
WSDL is an XML document
WSDL is used to describe Web services
WSDL is also used to locate Web services
WSDL is not yet a W3C standard
It possible to group together the definitions of several web services in one single WSDL document.
According to W3C
As communications protocols and message formats are standardized in the web community, it becomes increasingly possible and important to be able to describe the communications in some structured way. WSDL addresses this need by defining an XML grammar for describing network services as collections of communication endpoints capable of exchanging messages. WSDL service definitions provide documentation for distributed systems and serve as a recipe for automating the details involved in applications communication.