Three types of services that cloud computing provides are :
- Software as a service(SaaS)
- Platform as a service(PaaS)
- Infrastructure as a service(IaaS)
SaaS: Cloud consumers release their application in a hosting enviroment, which can be accessed through networks from various clients by application user. Cloud consumers do not have control over cloud infrastructure.Example: Sales Force.com, Google Mail, Google Docs (Krutz & Vines, 2010).
PaaS: PaaS is a development platform supporting the full software lifetime which allows cloud consumers to develop cloud service and applications directly on the PaaS cloud.Example: Google App Engine (Fazil Sabr, 2012).
IaaS: Cloud consumers directly use IT infrastructures provided by IaaS cloud. Example: Amazon's EC2 ("IEEE Cloud Computing Special Issue on Cloud Security", 2015).
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