Cloud computing happens on a public cloud, private cloud, or hybrid cloud. Governance and security are crucial to computing on the cloud, whether the cloud is in your company’s firewall or not.
Public clouds are virtualized data centers outside of your company’s firewall. Generally, a service provider makes resources available to companies, on demand, over the public Internet.
Private clouds are virtualized cloud data centers inside your company’s firewall. It may also be a private space dedicated to your company within a cloud provider’s data center.
Hybrid clouds combine aspects of both public and private clouds.
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Source:http://www.dummies.com/how-to/content/deploying-public-private-or-hybrid-clouds.html
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