Which cloud service model involves the provider managing all levels of the computing environment?

The cloud service model where the provider manages all levels of the computing environment is Software as a Service (SaaS). In this model, the service provider delivers software applications over the internet, which are fully managed on the provider's infrastructure. Users access these applications through a web browser without needing to install or maintain any software locally.

SaaS abstracts the complexities involved with hardware and software management, allowing users to focus solely on using the software for their business needs. This end-to-end management includes the underlying infrastructure, middleware, application software, and even the data, providing a comprehensive solution that requires minimal administrative effort from the user.

By using SaaS, organizations can benefit from automatic updates, scalability, and reduced costs associated with software ownership and maintenance. This makes it suitable for businesses looking for efficient and effective ways to deploy applications without the burden of managing the underlying resources themselves.