In which cloud computing service model does a provider's applications run on a cloud infrastructure and the consumer does not manage or control the underlying infrastructure?

The correct answer is Software as a Service (SaaS). In the SaaS model, applications are hosted by a service provider in the cloud, and users can access these applications over the internet. The key characteristic of SaaS is that the consumer does not manage or control the underlying infrastructure, including servers, storage, or network capabilities. This allows users to focus on using the applications without needing to worry about the technical details of how they are deployed or maintained.

SaaS is designed to provide easy access to software solutions, which are typically subscription-based, and include services like email, customer relationship management (CRM), and collaboration tools. This model is particularly beneficial for users who want to leverage applications without the complexities associated with management and maintenance of the software or the infrastructure it runs on.

In contrast, Platform as a Service (PaaS) allows users to manage and develop applications while maintaining control over the software layer but still relying on the infrastructure managed by the provider. Infrastructure as a Service (IaaS) offers the most control over the computing resources, allowing consumers to manage virtual machines and storage but requiring them to handle the operating systems and applications themselves. The phrase "Public Cloud" describes a type of cloud deployment model rather than a