Cloud Computing

SaaS, PaaS, IaaS – Software as a service, Platform as a service and Infrastructure as a service.
The broad idea is to treat IT Resources as an utility that you pay as you use, not overprovision upfront. Basically turning capital expenditure into operating expenses. So license fee becomes subscription fee.

SaaS – Google apps,

PaaS – Google apps engine that runs Google apps on Google infrastructure

IaaS – Amazon EC2 – Elastic Compute and S3 (Simple storage service) are popular implementations of Cloud computing paradigm., Joyent


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