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Diff btwn web apps and web services

 
VENKATESH NADAGOUDA
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Can someone tell me the difference between wea apps and web services and when to use which.
 
John Raab
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This post explained it pretty well:
http://www.coderanch.com/t/220150/Web-Services/java/Purpose-Web-Services-motivation-please
Basically the difference is this:
Web apps usually are delivered the user via a web browser of some sort, responding to user input and form posts. (Main presentation format: HTML)
Web services are back end processes that occur behind the scenes, allowing business processes to communicate with each other in an open and platform neutral way. (Common Delivery mechanism: XML over HTTP)
 
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