1. SaaS: Application
Today a SaaS application is most readily recognised and associated with user interactive web applications accessed directly over the internet (eg. the web application). Already synonymous with the SaaS phenomena is the likes of the infamous Salesforce.com for example.
However, SaaS as a concept caters for the full spectrum of functional software and therefore encapsulates but is not limited to the likes of rich or smart client applications that are hosted on the client’s machine all the way through to connected atomic services such as those provided as XML Web Services whether they be based on SOAP, REST or just POX.
The fact that the range of a SaaS:Application is so broad automatically begs the question of why this is a SaaS characteristic at all. In my opinion it is important if only to dispel the common misconceptions that SaaS is all about online “web applications” alone. In fact the SaaS model is much broader and does not even necessarily dictate that a SaaS:Application is “connected” at all.
In summary a SaaS:Application can be thought of encompasses all Software that is delivered in the context of the other five characteristics of SaaS.
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