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2. Cloud computing - Wikipedia

   en.wikipedia.org/wiki/Cloud_computing

   Cloud computing uses concepts from utility computing to provide metrics for the services used. Cloud computing attempts to address QoS (quality of service) and reliability problems of other grid computing models. [107] Cloud computing shares characteristics with:

3. Software as a service - Wikipedia

   en.wikipedia.org/wiki/Software_as_a_service

   Software as a service (SaaS / s æ s / [1]) is a cloud computing service model where the provider offers use of application software to a client and manages all needed physical and software resources. [2] Unlike other software delivery models, it separates "the possession and ownership of software from its use". [3]

4. as a service - Wikipedia

   en.wikipedia.org/wiki/As_a_service

   Software as a service (SaaS / s æ s / [63]) is a cloud computing service model where the provider offers use of application software to a client and manages all needed physical and software resources. [64] Unlike other software delivery models, it separates "the possession and ownership of software from its use". [65]

5. Infrastructure as a service - Wikipedia

   en.wikipedia.org/wiki/Infrastructure_as_a_service

   Services can be scaled on-demand by the user. According to the Internet Engineering Task Force (IETF), such infrastructure is the most basic cloud-service model. IaaS can be hosted in a public cloud (where users share hardware, storage, and network devices), a private cloud (users do not share resources), or a hybrid cloud (combination of both).

6. Platform as a service - Wikipedia

   en.wikipedia.org/wiki/Platform_as_a_service

   Platform as a service (PaaS) or application platform as a service (aPaaS) or platform-based service is a cloud computing service model where users provision, instantiate, run and manage a modular bundle of a computing platform and applications, without the complexity of building and maintaining the infrastructure associated with developing and launching application(s), and to allow developers ...

7. IT as a service - Wikipedia

   en.wikipedia.org/wiki/IT_as_a_service

   According to The NIST Definition of Cloud Computing, [3] there are three service models associated with cloud computing: infrastructure as a service (IaaS), platform as a service (PaaS), and software as a service (SaaS). The concept of ITaaS as an operating model is not limited to or dependent on cloud computing.