The term cloud computing is commonly employed as an abstraction to a set of dis-tributed and reconfigurable computing resources that can be provided on-demand to multiple users. Thus, cloud computing services are usually provided in three models. The first one is Software as a Service (Saas), where the end-user accesses the application-level software running on the cloud. A second model is known as Platform as a Service (PaaS), in which the provided resources are in the form of appli-cation development platforms. Finally, a third model is Infrastructure as a Service (IaaS), where the user has the freedom to dynamically provision and tailor computing resources to their needs.
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