Web Services

I went through some of the article published and found that:
Web service can be used  to convert a application into web application.Web service are published and found through the web.The web service are used by the developer to develop and deploy web application.

The web application has value for the end user not the web service.The web service is valued by the developer. 
The platform components of the web service includes:SOAP(simple object access protocol),UDDI(universal descriptor,discovery and integration),WSDL.


As we can see in the figure above the web service provider publishes the web service with the web service broker.The web service published with the broker is described using the WSDL(Web service description language).The web service requester will discover the service via a service  broker. The communication between the web service provider and the broker is done by using XML messages which are exchanged among them.The protocol used for communication is SOAP.


There are two uses of web service :

1. Web service can be used as reusable components in the web application or any other application.(eg. currency convertor).
2. The web service can be used to connect existing software system which are based on different platforms.