Cloud Broker
An entity that manages the use, performance and delivery of cloud services, and negotiates relationships between Cloud Providers and Cloud Customers.
Source:
[NIST SP 500-292] Liu, F., Tong, J., Mao, J., Bohn, R., Messina, J., Badger, L., Leaf, D., NIST Cloud Computing Reference Architecture, NIST Special Publication 500-292, September 2011.


