Which cloud model usually has the least amount of user control over the underlying infrastructure?

In the context of cloud computing, Software as a Service (SaaS) is the model that typically provides the least amount of user control over the underlying infrastructure. With SaaS, users access software applications through the internet, and these applications are hosted and maintained by a service provider.

This model abstracts away most, if not all, of the complexities associated with infrastructure management—from servers, storage, and networking to the operating systems and middleware. Users simply interact with the application through a web interface, focusing primarily on the functionality offered rather than how it operates behind the scenes.

This contrasts with other models such as Infrastructure as a Service (IaaS) and Platform as a Service (PaaS), where users have more control. IaaS allows users to manage virtualized computing resources, including servers and storage, giving them significant control over their infrastructure. PaaS provides a platform that allows developers to build, test, and deploy applications while still offering some level of control over the environment and application configurations. In a Private Cloud, organizations typically have even more control, as they manage their own dedicated infrastructure.

Given this understanding, it's clear that SaaS offers the least degree of control to users regarding the infrastructure underlying the applications they utilize,