A cloud web hosting service means that each part of your world-wide web presence will be maintained by an individual server. For example, 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 resources to the fullest. Whether you will get a real cloud service or not also depends on the CP that you will use to manage your account. Because most control panels were intended to work on a single server, they cannot work on a cloud platform whatever a given Internet hosting provider may advertise. In case one service stops responding, the entire server could go offline, so your Internet sites won't be accessible. This is the reason why you should check what service you'll actually receive in case you are looking for cloud hosting before you purchase anything.