A cloud Internet hosting service means that each part of your world-wide web presence will be taken care of by an individual server. For example, your files and databases will be managed by separate machines and since only one kind of processes will run on a server, every machine will perform better and will use its system resources to the highest. Whether you'll get a real cloud service or not also depends on the control panel that you will use to manage your account. Because most control panels are designed to work on a single server, they can't work on a cloud platform regardless of what a given web hosting provider would advertise. If one service stops responding, the whole server may go down, so your Internet sites won't be accessible. That's why you should check what service you'll actually get if you are looking for cloud web hosting before you buy anything.