IaaS PaaS & SaaS are three Cloud computing models popular in the market. Depending upon the requirement a user can opt for any of the three models. Here we have explained IaaS, PaaS & SaaS model in the best possible way so that even a beginner can understand and differential among them.
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http://blog.webspecia.com/cloud/iaas-paas-saas-explained-examples-comparison
