There are two primary deployment models of clouds: public and private. A public cloud is a set of hardware, networking, storage, services, applications, and interfaces owned and operated by a third party for use by other companies or individuals. A private cloud is a set of hardware, networking, storage, services, applications, and interfaces owned and operated by an organization for the use of its employees, partners, and customers.
A Hybrid Cloud uses a combination of both public and private models to create a Hybrid Cloud Environment. The goal is to combine services and data from a variety of cloud models to create a unified, automated, and well-managed computing environment. See also Private Cloud and Public Cloud