There is specific technology behind cloud computers that makes cloud computing versatile, trustworthy, and usable. The following are the technologies:
Virtualization is a strategy that allows several companies or tenants to share a single physical instance of an application/resource (customers). This is done by assigning the logical name of a physical resource and supplying the physical resource when required.
The Multi-Level Architecture provides virtual separation between several people. Therefore, the organizations can customize their program as if they have their respective instances.
Applications for other applications, independent of the kind of vendor, product, or technology, can be used by the Service-oriented Architecture. Thus, it is feasible to share data between different vendor apps without additional programming or changes to services.
Grid Computing means distributed computing, where a collection of machines are connected from many locations to reach a shared goal. These are heterogeneous and geographically distributed computing resources.
Grid Computing splits large tasks into smaller components spread across grid-induced CPUs.
The Pay-per-Use model is used in utility computing. As a metered service, it gives computer resources on request. The notion of utility computing is built on cloud computing, grid computing, and managed IT services.