The four primary categories of cloud computing are private clouds, public clouds, hybrid clouds, and multi-clouds. Additionally, there are three primary models of cloud computing services: Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS), and Software-as-a-Service (SaaS). Enterprise Storage-as-a-Service Deployment Options vary from enterprise STaaS on-premises, at your data center, and in the public cloud.