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Delivery Models of Cloud Computing
Software-as-a-Service means a software distribution model whereby software applications and programs are hosted by a vendor or service provider and made available to customers over a network connection.
Platform-as-a-Service means a software platform environment which allows developers to build their own web software applications by using templates provided by the platform vendor.
Infrastructure-as-a-Service means a model whereby an organisation outsources the hardware and software it requires to support its business operations, and the provider of that hardware and software provides the equipment and relevant applications and is responsible for housing, running and maintaining it, with the client payment typically being made on a per-use basis.