A search in your favorite search engine for "cloud computing" would be a good place to start. As you will see, exactly what "cloud computing" means depends on the exact context. It is a technical term given to several different but related concepts, and it is also a popular marketing term.
This section of the forum is for CloudLinux (which is a cPanel partner), not "cloud computing" in general. CloudLinux has a very specific purpose: to try to prevent one shared hosting user from using all of the resources on a shared hosting server. You can learn all about it on the CloudLinux site:
CloudLinux OS
CloudLinux is really not about making it possible for you to run your own "cloud" at all. It is simply a name given to a Linux kernel and some utilities that can be added to a CentOS installation to increase control over shared hosting users.
"Cloud computing" is in such common use as a buzzword, that it is best to ask for specific details about what it means, from anyone who is trying to sell you a "cloud"-based product.