Hybrid Cloud
The cloud infrastructure is a composition of two or more distinct cloud infrastructures (private, community, or public) that remain unique entities, but are bound together by standardized or proprietary technology that enables data and application portability (e.g., cloud bursting for load balancing between clouds).
Source:
[NIST SP 800-145] Mell, P., Grance, T., The NIST Definition of Cloud Computing, NIST Special Publication 800-145, September 2011.
