What does WSDL stand for?

A WSDL is an XML document that describes a web service. It actually stands for Web Services Description Language. SOAP is an XML-based protocol that lets you exchange info over a particular protocol (can be HTTP or SMTP, for example) between applications
 
Web Services Description Language (WSDL) is an XML-based language that describes Web services and their uses.

A WSDL document is a concrete description of a Web service that includes both abstract and concrete elements.

WSDL describes the abstract functionality of a service and provides a framework for describing the concrete details of a service description. This formal description is required in order for distributed systems and communication between software applications.
 
WSDL is a sort of contract between creator and user of web services. The producer of a web-service creates a WSDL file through a WSDL generation tool. The contents can be a function and its the type of parameters it accepts and the location of the service. This all information is available in neutral language like XML inside the WSDL file.
 
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