What type of cloud deployment is used by a single organization but may be hosted externally?

A public cloud is available to the general public or a large industry group and is provisioned over the public internet, shared among multiple organizations.

A private cloud is a cloud computing environment dedicated exclusively to a single organization. Although it can be hosted on-premises in the organization's own data center, it can also be hosted externally by a third-party service provider, as long as the underlying infrastructure and resources are isolated and dedicated to that specific organization.

A community cloud is shared by several organizations that have common concerns, such as security requirements or policy, rather than being dedicated to a single organization.

A hybrid cloud is a mix of two or more distinct cloud infrastructures (private, public, or community) that remain unique entities but are bound together by proprietary technology, allowing data and application portability.