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The [[software-as-a-service]] (SaaS) service-model involves the cloud provider installing and maintaining software in the cloud and users running the software from cloud over the Internet (or Intranet). The users' client machines require no installation of any application-specific software since cloud applications run in the cloud. SaaS is scalable, and system administrators may load the applications on several servers. In the past, each customer would purchase and load their own copy of the application to each of their own servers, but with the SaaS the customer can access the application without installing the software locally. SaaS typically involves a monthly or annual fee.<ref name="Chou">
{{cite book|title = Introduction to Cloud Computing: Business & Technology|first = Timothy|last = Chou|url = https://www.scribd.com/doc/64699897/Introduction-to-Cloud-Computing-Business-and-Technology}}</ref><ref>{{cite web |last1=Daisy |first1=witson |title=what is cloud computing |url=https://www.janbasktraining.com/blog/what-is-cloud-computing/ |publisher=JanBask}}</ref>
Software as a service provides the equivalent of installed applications in the traditional (non-cloud computing) delivery of applications.<ref name="enterpriseirregulars">
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