With both IaaS and PaaS offerings, organizations have a lot of fine-grained control over the building, configuration, and deployment of infrastructure and applications. With SaaS applications, all of those management pieces are further separated from administrators and users.

SaaS products are fully deployed applications that are updated and managed by the service provider. When using SaaS applications, administrators usually don't have as many configuration tools available to them. The boundaries of what they can manage are well defined by the service provider. SaaS builds on the services offered by the provider. In the following diagram, you can see how now even the delivery of applications is managed by the cloud service provider. ...

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