Cloud Service Delivery Models
As mentioned earlier, a cloud is basically pools of resources exposed as services to cloud consumers, who can tap into those services on demand and pay for them on a utility basis. These pools of resources may be infrastructure pools, where storage, network, and server hardware resources are made available as a service to consumers, or they may be pools of software services that users intend to share. Depending on what is exposed as a service through the cloud interface to the consumer, different delivery models exist. The most common classification divides them into three broad categories: Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS).
There are subcategories ...
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