A service model defines the level of management, control, and responsibility shared between the cloud provider and the customer.

A deployment model defines where cloud infrastructure is hosted, who manages it, and who has access to it.

The primary service models are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).

The primary deployment models are Public Cloud, Private Cloud, Hybrid Cloud, and Multi-Cloud.

Their role is to establish how cloud resources are structured, hosted, secured, and managed to align with organizational and technical needs.