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What is IaaS, PaaS, SaaS?

IaaS : Infrastructure as a Service
eg: Amazon EC2, Rackspace, Verizon Private Cloud.
PaaS : Platform as a Service
eg: App Engine, Azure.
SaaS : Software as a Service
eg: Google Docs, Acrobat.com.
Here is a collection of slideshows about IaaS, Paas and SaaS.
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