Most servers are under utilized and expensive. To compensate hosting companies put hundreds accounts on one server. This is a problem when one of the application fails on the server. If one fails, they all fail. So the reliablily of your application is only as good as the least relaible application in this shared hositing enviroment. To correct this problem we virtualize the server into many server. Doing this will isolate error to the virtual server only. This allow better performance and increased reliablity in your web application. Simple put "virtualize server are better that shared".

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