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Introduction to cloud computing
{{merge-to|Cloud computing|discuss=Talk:Cloud computing#Introduction to Cloud computing|date=March 2012}}
{{Introductory article|Cloud computing}}
[[File:Cloud computing.svg|400px|thumb]]
The two words in the phrase ''cloud computing'' have the following interpretations:

* '''Cloud''': As a noun, this is a metaphor for the [[Internet]],<ref name=Metaphor>{{cite web|url=
(contracted; show full)
==Deployment models==

There are several cloud-computing '''deployment models''', and these represent different types of exclusive and non-exclusive clouds provided to consumers or groups of consumers.<ref name=NISTDefn/>

===Public cloud===

'''Public clouds''' are cloud systems that are made available to any 
entity inmember of a non-exclusive group, such as the general public, or all organisations in a specific industry. Because there are many consumers, these are multi-tenanted clouds. They are owned by cloud providers, and are off-premise for all consumers.

The cloud is ''public'' only in the sense that, potentially, any entityperson or organisation that requires the provided services can become a consumer, and a public cloud may not necessarily be of interest to every entityuniversal interest. For example, a SaaS public cloud might provide an accounting system that is of interestuseful only to certain types of small business.

===Private cloud===

'''Private clouds''' are cloud systems that are accessible only by a single entity, or by an exclusive group of related entities that share the same purpose and requirements, such as all the business units in a single organisation. They are generally single-tenanted, but they can be multi-tenanted if the individual group members act as separate consumers. They may be owned by a cloud provider and be located off-pre(contracted; show full)*[[Platform as a service|Platform as a Service]]
*[[Software as a service|Software as a Service]]

=References=
{{Reflist|30em}}

{{DEFAULTSORT:Cloud computing}}
[[Category:Cloud computing]]