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Software as a Service (SaaS) is indeed a class of Cloud Computing. It refers to a model where software applications are hosted in the cloud and made available to users over the internet. This eliminates the need for individual installations on local devices, allowing users to access the software anytime, anywhere, as long as they have internet connectivity.

SaaS encompasses a wide range of applications, from common productivity tools like email and collaboration software to specialized applications tailored for specific industries. This model is favorable as it often comes with subscription pricing, automatic updates, and scalability options, which can significantly reduce the IT overhead for organizations.

In the broader context of Cloud Computing, other models also exist, such as Infrastructure as a Service (IaaS) and Platform as a Service (PaaS), but all of these – including SaaS – fall under the umbrella of Cloud Computing. Their shared characteristic is the delivery of computing resources and services over the internet, making SaaS a valid classification within this domain.