A cloud web hosting service means that every single part of your world-wide web presence will be handled by a different server. For instance, your files and databases will be managed by different machines and since only one kind of processes will run on a server, every machine will perform better and will use its resources to the highest. Whether you'll get a true cloud service or not also depends on the control panel that you will use to handle your account. As most control panels are designed to work on a single server, they are unable to work on a cloud platform regardless of what a given Internet hosting service provider could advertise. In the event that one service stops responding, the entire server may go down, so your Internet sites will not be accessible. This is the reason why you should check what service you will actually get if you are looking for cloud hosting before you purchase anything.