Web Services as standard of connecting heterogeneous information systems

Web Services combine the best of both distributed componentization and the World Wide Web [3]. It brings distributed computing to broad range of client applications. Web Services allow access to software components through standard Web protocols such as HTTP, SMTP and XML. In short, a web service could be observed as a component running on the web server, exposed to the world through standard Internet protocols. Using XML and Internet Protocols concept of web service enables use of any technology, any language and any device for both server and client side in client - server model. Field of usage of web service is very large. Whenever there is a need of network communication for two applications, a web service can step in.