Web services are self-describing modular applications that enable distributed computing over the Internet. Web services can provide anything from simple information requests to complicated business processes. Web services can be published, located, and invoked remotely across the Web.
Web service interfaces provide enough detail to allow the development of calling applications. This interface is typically described in an XML document named a Web Services Description Language (WSDL) file. Web service messages are defined using the SOAP protocol, and are conveyed using HTTP.
Software applications written in different programming languages and running on various platforms can all use web services to exchange data and processes. This interoperability (for example, between Microsoft Windows and Linux applications) is possible because web service architecture is based on accepted open standards.
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