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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).
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.
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] SaaS is usually accessed via a web application.
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 ...
Comparison of on-premise, IaaS, PaaS, and SaaS Cloud computing service models arranged as layers in a stack. The National Institute of Standards and Technology recognized three cloud service models in 2011: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). [2]
Payments as a service (PaaS) is a marketing phrase used to describe software as a service to connect a group of international payment systems. The architecture is represented by a layer – or overlay – that resides on top of these disparate systems and provides for two-way communications between the payment system and the PaaS.
SaaS (Software as a Service) Initial release date License(s) Written in As a service Local installations fluid Operations eCloudManager: 2009-03-01 Proprietary: Java, Groovy No Yes AppScale [33] 2009-03-07 Apache License: Python, Ruby, Go Yes Yes Cloud Foundry: 2011-04-12 Apache License: Ruby, C, Java, Go Yes Yes Cloud.com / CloudStack [34 ...
The focus was on Infrastructure-as-a-Service (IaaS) based offerings but the interface can be extended to support Platform and Software as a Service offerings [3] as well. IaaS is one of three primary segments of the cloud computing industry in which compute, storage and network resources are provided as services.