When it comes to web hosting, cloud architecture refers to using a different server for every single part of the web hosting service. Such a configuration leads to a lot better performance since one machine will be used only for file storage, another just for running databases, and so on, therefore different system processes will not run on the very same machine. The latter will lessen the chance of system errors significantly and will allow your sites to work faster, not mentioning the better uptime. In case you are looking for such a service, you need to make sure that you'll really get it as lots of companies advertise cloud web hosting packages, yet the control panels they use aren't designed to function in a true cloud and can operate only on one server. The issue with using just a single machine is that in the event that one service crashes or generates high load, the whole server will most probably go offline, so your sites will no longer be accessible.