Cloud computing is a basic term for something that includes delivering a hosted service over the Internet. These internet services are generally separated into three main categories: Infrastructure-as-a-Service (IaaS), Software-as-a-Service (SaaS) and Platform-as-a-Service (PaaS). So, the term cloud computing was started by the cloud symbol that is frequently used to symbolize the Internet in diagrams and flowcharts.

A typical cloud service has three very different characteristics that separate it from the more traditional kind of hosting. This cloud computing is sold on a demand basis, usually per minute or by the hour; it is sort of elastic. The user can have as little or as much of the service as they what to have at any specific time; and this service is handled by the provider.


So, the consumer will have to get nothing, they just need to have their own personal computer and Internet access. Dramatic changes in the virtualization and distributed computing, as well as much improved access to high-speed Internet plus a weak economy, has accelerated the interest in cloud computing.

A cloud is able to be set up as public or private. A public cloud can sell services to any consumer on the Internet. Presently, Amazon Web Services is the biggest public cloud provider. A private cloud is more of a proprietary company or it could be a data center that will supply cloud hosted services to a small group or a smaller number of people.

When the service provider uses the public cloud resources to build their private cloud, the outcome is called a virtual private cloud. Whether public or private, the main goal of cloud computing is now to provide an easier and more scalable access to computing resources and to IT services.

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