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What Is WSDL?

Through its ability to define the functionality provided by a web service, WSDL has revolutionized the way services are attached to specific network protocols. This blog post delves into the significance of WSDL in the modern IT environment, highlighting its role in shaping the interaction between client applications and web services, thus facilitating seamless communication. 

What is Web Services Description Language (WSDL)?

Web Services Description Language, abbreviated as WSDL, is an XML-based language utilized to describe the functionality offered by a web service. It provides a way to describe services and how they are bound to specific network protocols. It gives a structured way to define web services and their methods, making it a cornerstone in the world of web services.

Purpose of Web Services Description Language

The primary purpose of WSDL is to ensure that client applications can interact with the web service. By providing a detailed description of the service, including its name, location, and the methods it exposes, WSDL allows client applications to understand what the service does without any human intervention. It essentially serves as a contract between the service and the client, detailing what the service does and how to communicate with it.

How Web Services Description Language works

The functioning of Web Services Description Language is based on defining various elements within an XML document. These elements define the data types, messages, operations, and the binding of these operations to a specific protocol.

  1. Data types: WSDL uses XML Schema Definition (XSD) to define the data types used in web services.
  2. Messages: These are abstract definitions of the data being transmitted.
  3. Operations: Operations are actions supported by the web service. Each operation refers to an input message and output message.
  4. Binding: This defines the protocol and data format for each operation.

Once the WSDL file is created, it is published in a universally accessible place. The client application can then read this file to understand how to use the web service.


Web Services Description Language (WSDL) plays a pivotal role in the world of web services. It outlines the way services are offered and accessed over the web. By defining the data types, messages, operations, and their bindings, it ensures seamless interaction between client applications and web services.

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