Why Webservices? and not only http?

Hi,
why I cannot simply use http request, hit the URL and in response send the xml? whats the need of webservices?
I know some of the advanctages of web services is:
Platform independent but i guess we can achieve the same with http resquest and xml response as well.
Please put some light on the same.
Thanks

My two cents
When you are just sending only one record then you don't need to worry about performance, because it will not vary much betwen normal http and web service.
Also when you are using http you need to write code to for the xml file and also the client which receives the xml file should decode the format. This will add additional work in both client and server side.
In Web services we can avoid that. Also even it is only one record it is always better to follow standardization for future work.
correct me if am wrong.

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