What type of cloud type is used by multiple organizations that have overlapping or common requirements and goals?
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In cloud computing a Community Cloud is an environment shared by a limited set of organizations that are working together to create an offering that addresses similar concerns. For example a group of banks may create a cloud offering that addresses common security and compliance concerns in the banking industry.
Wikipedia
A community cloud in computing is a collaborative effort in which infrastructure is shared between several organizations from a specific community with common concerns (security, compliance, jurisdiction, etc.), whether managed internally or by a third party and hosted internally or externally. This is controlled and used by a group of organizations that have shared interests. The costs are spread over fewer users than a public cloud (but more than a private cloud), so only some of the cost savings potential of cloud computing are realized.The community cloud is provisioned for use by a group of consumers from different organizations who share the same concerns (e.g., application, security, policy, and efficiency demands).
Community_cloud - Wikipedia, the free encyclopedia 