A cloud Internet hosting service means that every single part of your online presence will be maintained by an individual server. For instance, your files and databases will be managed by different machines and since just a single type of processes will run on a server, every machine will perform better and will use its system resources to the fullest. Whether you will get a genuine cloud service or not also depends on the CP that you'll use to handle your account. As most control panels were made to function on a single server, they are unable to work on a cloud platform regardless of what a given web hosting service provider would advertise. If one service stops responding, the entire server can go offline, so your websites will not be accessible. That's why you should check what service you'll actually receive if you are looking for cloud hosting before you purchase anything.