SaaS in the Workplace
Below is is an extract from an article entitled: The Realities of Cloud Formation
The article, by Quocirca, a business and IT analysis firm explains the three levels of on-demand offerings, of which SaaS, Software as a Service is the best known.
The other two levels are PaaS, Platform as a Service and IaaS, Infrastructure as a Service essentially make up the three levels of on-demand offerings. These mirror the way IT is increasingly deployed internally.
"The lowest level is infrastructure-as-a-service (IaaS). This is where pre-configured hardware is provided via a virtualised interface or hypervisor. There is no high level infrastructure software provided such as an operating system, this must be provided by the buyer embedded with their own virtual applications.
IaaS is particularly useful for organisations that are running virtualised applications internally, but may want to make use of additional capacity when their own resources are stretched. On demand storage is also considered as IaaS.
Platform as a service (PaaS) goes a stage further and includes the operating environment included the operating system and application services. PaaS suits organisations that are committed to a given development environment for a given application but like the idea of someone else maintaining the deployment platform for them.
SaaS goes the whole hog, offering fully functional applications on-demand to provide specific services such as email management, CRM, ERP, web conferencing and an increasingly wide range of other applications" ...
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