What are the key differences between IaaS, PaaS, and SaaS?

IaaS provides infrastructure, PaaS offers platforms for development, and SaaS delivers ready-to-use applications. Control levels differ: IaaS users manage more, PaaS reduces server responsibilities, and SaaS requires no management. Pricing also varies, with IaaS often pay-as-you-go, PaaS subscription-based, and SaaS per-user or per-month. Together, they represent the three primary layers of cloud computing services
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