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The emergence and growing popularity of cloud computing signals an evolution in the way IT infrastructure and services are delivered and consumed. Cloud services have a number of essential characteristics, such as self-service on-demand consumption, location independence, and rapid elasticity. There are also evolving cloud delivery models, including Infrastructure-as-a-Service (IaaS), platform-as-a-service, and software-as-a-service, which provide IT infrastructure, application development services, and software applications from the cloud, respectively.
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