WSDL: WSDL is an acronym for Web Services Description Language. It is connected to SOAP. It defines how the Web service works so that you may refer to it when you make a REFERENCE to it. The Web Services Description Language (WSDL) is an XML-based interface description language for specifying a web service's capabilities. Any specific WSDL description of a web service (also referred to as a WSDL file) that offers a machine-readable explanation of how the service can be called, what parameters it EXPECTS, and what data structures it returns is also referred to by the acronym. As a result, it serves a similar purpose to a type signature in a programming language.

Services are described in the WSDL as groups of network endpoints or ports. For this reason, the WSDL definition specifies an XML format for documents. The abstract definitions of ports and messages are abstracted from their real application or instance, allowing them to be reused. A service is defined by associating a network address with a reusable binding, and a group of ports is formed by associating a network address with a reusable binding. Port types are abstract collections of supported operations, while messages are abstract descriptions of the data being exchanged. The concrete protocol and data format specifications for a specific port type comprise a reusable binding, which BINDS operations and messages to a specific network protocol and message format. WSDL DESCRIBES the public interface to the Web service in this way.