Answer Posted / swapna

Web service is one of main component in Service Oriented
Architecture. You could use web services when your clients
and servers are running on different networks and also
different platforms.

This provides a loosely coupled system. And also if the
client is behind the firewall it would be easy to use web
service since it runs on port 80 (by default) instead of
having some thing else in Service Oriented Architecture
applications.

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