Advocates of public and hybrid clouds note that cloud computing allows companies to avoid or minimize up-front IT infrastructure costs. Proponents also claim that cloud computing allows enterprisesto get their applications up

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References to the phrase "cloud computing" appeared as early as 1996, with the first known mention in a Compaq internal document.
The cloud symbol was

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The goal of cloud computing is to allow users to take benefit from all of these technologies, without the need for deep knowledge about or expertise with each one of them. The cloud aims to cut costs and helps the users focus on their core business instead of being

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Though service-oriented architecture advocates "Everything as a service" (with the acronyms EaaS or XaaS, or simply aas), cloud-computing providers offer their "services" according to different models, of which the three standard models per NISTare Infrastructure as a

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Private cloud
Private cloud is cloud infrastructure operated solely for a single organization, whether managed

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Cloud architecture, the systems architecture of the software systemsinvolved in the delivery of cloud computing, typically involves multiple cloud components

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Cloud computing exhibits the following key characteristics:
• Agility for organizations may be improved, as cloud computing may increase users' flexibility with re

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