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...Cloud computing as a utility developers of new internet services no longer require large capital outlays in hardware to deploy their service or the human expense operate it thus avoiding both over provisioning and under refers apps delivered system software datacenter that provide those themselves are referred saas is what we will call available pay you go model general public being sold private internal data centers business other organization not made sum users providers top level can be recursive also for example provider rental maps might user craigslist google aspects from point view illusion infinite resources on demand thereby eliminating need plan far ahead elimination an up front commitment by allowing companies start small increase only when there needs ability use short term basis needed e g processors hour storage day release them rewarding conservation letting machines they useful all three important technical economic changes possible past efforts at failed each case one ...