NIST defines three service models which describe the different foundational categories of cloud services:Infrastructure as a Service (IaaS) offers access to a resource pool of fundamental computing infrastructure, such as compute, network, or storage. We sometimes call these the “SPI” tiers.Platform as a Service (PaaS) abstracts and provides development or application platforms, such as databases, application platforms (e.g. a place to run Python, PHP, or other code), file storage and collabo…

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