As we are in the early stages of the transformation offered by cloud computing, there is lot of confusion around how various solutions and offerings fit in the overall picture for enterprise customers and the benefits of various offerings. Whether you have to deliver SaaS, PaaS, or Custom Applications there are three building blocks you need to deliver them: a datacenter with virtualization, an IaaS layer on top of virtualization and application management for efficient deployment. The argument now is that you don’t need virtualization or IaaS to deliver the SaaS or PaaS offerings, however, if you care about efficiency and agility you will be better off leveraging the IaaS layer running on top of the virtualization layer and using a tool for application management and for deploying your solutions. All major SaaS and PaaS players have built their own private cloud computing models for efficiently delivering the public SaaS and PaaS solutions.
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