A public cloud is a multi-tenant Infrastructure-as-a-Service (IaaS) that typically includes compute, networking, and storage resources. These resources are available via API, provisioned through self-service, and metered by usage. RightScale supports a range of popular public clouds with data centers around the globe.
A private cloud is a single-tenant IaaS that may be located in a private data center or hosted by a vendor. Private clouds are similarly accessible via API, provisioned through self-service, and metered by usage. RightScale supports the three most popular private cloud technologies and several hosted private cloud offerings.