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The National Institute of Standards and Technology (NIST), a division of the US Department of Commerce, defines cloud computing as “a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that are rapidly provisioned and released with minimal management effort or service provider interaction.” Within the NIST definition of cloud computing, three service models exist: software as a service (SaaS), platform as a service (PaaS), and infrastructure as a service (IaaS). |
