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Unlike IaaS and PaaS is SaaS a general architecture concept and not limited to Cloud?

 
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In Cloud, we have 3 kinds of services: IaaS, PaaS and SaaS. SaaS means a centrally deployed software which will be used by multiple clients. While IaaS and PaaS are limited to Cloud, is SaaS a general concept and not limited to Cloud? Thanks.
 
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What does Cloud mean in your question?  Are you only thinking of off-premise services which are accessed over the Internet such as AWS, Azure, GCP?
 
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Ron McLeod wrote:What does Cloud mean in your question?  Are you only thinking of off-premise services which are accessed over the Internet such as AWS, Azure, GCP?


Yes. I mean cloud like AWS and Azure.
 
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Monica Shiralkar wrote:Yes. I mean cloud like AWS and Azure.


Well then I don't agree with your statement: "IaaS and PaaS are limited to Cloud".

I use KVM and VMware for IaaS, and Tomcat and WebLogic for PaaS; they have nothing to do with Cloud.
 
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Ron McLeod wrote:

Monica Shiralkar wrote:Yes. I mean cloud like AWS and Azure.


Well then I don't agree with your statement: "IaaS and PaaS are limited to Cloud".

I use KVM and VMware for IaaS, and Tomcat and WebLogic for PaaS; they have nothing to do with Cloud.



Thanks. Understood this.

Regarding using SaaS on Cloud, does it mean deploying an application on cloud and any clients which want to access your application will have to subscribe once (you may save these subscription details in a database)?
 
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Monica Shiralkar wrote:Regarding using SaaS on Cloud, does it mean deploying an application on cloud and any clients which want to access your application will have to subscribe once (you may save these subscription details in a database)?


I don't actually know what the requirements are for something to be called SaaS, but I doubt there is a requirement that users must first subscribe (although subscriptions are probably the norm).

If Netflix and Office365 are considered SaaS, then I do need subscriptions to be able to use those applications.  However if Dropbox and Zoom are considered SaaS, then I don't need a subscription to use them as long as someone else who that does have a subscription invites me to use the application with them.  I can download a file that someone else placed on Dropbox, and I can join a meeting that someone else created on Zoom; both without be a subscriber.
 
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Thanks.Understood. Netflix,Office365, Dropbox and Zoom  are SaaS but not related to Cloud. My question is about SaaS in cloud.
 
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Where do those services run if not in the cloud?

Netflix uses AWS, and I assume Office365 uses Azure; not sure about the others.
 
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Ron McLeod wrote:Where do those services run if not in the cloud? .



If not on cloud then on premises. My understanding is that if one hosts an application and it serves multiple clients then it is Software as a Service to the clients.

Ron McLeod wrote:Where do those services run if not in the cloud?

Netflix uses AWS, and I assume Office365 uses Azure; not sure about the others.



I think it can be either as our own application hosted somewhere and serving multiple clients or which the Cloud provides as SaaS like Netflix (AWS).

In both the cases , all the clients can do is use the services but have no control over code/infrastructure.
 
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