1.3 Service Model
Based on the hybrid model above, public cloud service can offer a multitude of services to customers. Typically, services can fall under one of three service models. VMware defines these service layers as:
• Infrastructure as a Service (IaaS) – Infrastructure containers are presented to consumers to provide agility, automation, and delivery of components.
• Software as a Service (SaaS) – Business-focused services are presented directly to the consumer from a service catalog.
• Platform as a Service (PaaS) – Technology-focused services are presented for application development and deployment to application developers from a service catalog.
This service definition primarily focuses on Infrastructure as a Service. A service provider can, however, include additional “as a Service” offerings on top of the core cloud platform.
Figure 2. Service Models
