Here are the benefits of using Web Services:
1. Exposing the function on to network: A Web service can be remotely invoked using HTTP. So, Web Services allows you to expose the functionality of your existing code over the network. Once it is exposed on the network, other application can use the functionality of your program.
2. Connecting Different Applications: Web Services allows different applications to talk to each other and share data and services among them. Other applications can also use the services of the web services. For example VB or .NET application can talk to java web services and vice versa. So, Web services are used to make the application platform and technology independent.
Full Description: http://www.javajazzup.com/issue11/page20.shtml
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