There are many definitions for cloud computing, but one of the more concise and widely recognized definitions comes from the National Institute of Standards and Technology (NIST). NIST defines five essential characteristics, three service models and four deployment models. The essential characteristics form the core of the definition. The required characteristics for any solution to be called a true “cloud” solution include:
- On-demand self-service
- Broad network access
- Resource pooling
- Rapid elasticity
- Measured service
NIST also defines three service models, or what are sometimes called architecture layers:
- Infrastructure as a Service (IaaS)
- Software as a Service (SaaS)
- Platform as a Service (PaaS)
Finally, it defines four deployment models:
- Private Cloud
- Community Cloud
- Public Cloud
- Hybrid Cloud
Read more at source - http://technet.microsoft.com/en-us/magazine/hh127072.aspx
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