The National Institute of Standards and Technology has presented the most clear and comprehensive definition of cloud computing. It distinguishes cloud characteristics, delivery model, and deployment method. The Institute says there are five key features of cloud computing: on-demand self-service, ubiquitous network access, location-independent resource pooling, rapid elasticity, and measured service.
Computing can take the form of software-as-a-service (running specific applications through a cloud), platform-as-a-service (using a suite of applications, programming languages, and user tools), or infrastructure-as-a-service (relying on remote data storage networks). Deployment depends on whether the cloud is a private, community, public, or hybrid one. Private clouds are operated for a specific organization, for example, whereas community clouds are shared by a number of organizations. Public clouds are available to the general public or large groups of agencies, while hybrid clouds combine public and private elements in the same data center.
Computing can take the form of software-as-a-service (running specific applications through a cloud), platform-as-a-service (using a suite of applications, programming languages, and user tools), or infrastructure-as-a-service (relying on remote data storage networks). Deployment depends on whether the cloud is a private, community, public, or hybrid one. Private clouds are operated for a specific organization, for example, whereas community clouds are shared by a number of organizations. Public clouds are available to the general public or large groups of agencies, while hybrid clouds combine public and private elements in the same data center.
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