Platform as a service (PaaS) is the second category of cloud computing. It provides computational resources via a platform upon which applications and services can be developed and hosted. PaaS usually makes use of dedicated API's to control the behavior of a server hosting engine which executes and replicates the execution environments according to user requests. As each provider exposes his/her own API according to the respective key capabilities, applications developed for one specific cloud provider can not be moved to another cloud host. However there are attempts to extend generic programming models with cloud capabilities. Examples of PaaS providers.
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