- Public Cloud, Public cloud or external cloud describes cloud computing in the traditional mainstream sense, whereby resources are dynamically provisioned on a fine-grained, self-service basis over the Internet, via web applications/web services, from an off-site third-party provider who shares resources and bills on a fine-grained utility computing basis.
- Hybrid Cloud,
A hybrid cloud environment consisting of multiple internal and/or external providers "will be typical for most enterprises".
- Private Cloud,
Private cloud and internal cloud are neologisms that some vendors have recently used to describe offerings that emulate cloud computing on private networks.