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Web services, also called as application services, describe a standardized way to integrate the Web-based applications using the XML, SOAP, WSDL and UDDI open standards over an Internet protocol backbone. XML is used for labeling the data, SOAP is used for transferring the data, WSDL is used for describing the services available and UDDI is used for listing what services are available.
The WWW (World Wide Web) is more used for application to application communication. The programmatic interfaces made available are referred to as Web services. Web services primarily used as a means for business to communicate with each other and clients. Organizations can communicate their data with web services without intimate knowledge of each other’s IT systems behind the firewall.
Web services do not provide the user with GUI (Graphical User Interface) rather share business data, logic, and processes via a programmatic interface across a network. The developers can then add the Web service to a GUI for offering particular functionality to users. Web services allow the different applications from various sources for communicating with each other without long custom coding, as all communication is in XML.
The Web services are not bound to any one operating system or programming language. For instance, Java can interact with Perl, Windows applications can interface with UNIX applications. These do not require the use of browsers or HTML. The web services allows the software functionality available over the Internet, so that the programs like ASP, PHP, JSP, JavaBeans, the COM object can make a request to a program running on another server and use that program’s response in a website, WAP service, or other application.