An organization has its own cloud deployment that it administers within its own network but also uses select cloud services over the open Internet. This is an example of what cloud deployment model?
The hybrid cloud model combines public and private clouds. The main portion of deployment is usually private, while selection services utilize the public cloud.
Wikipedia
Cloud computing is the on-demand availability of computer system resources, especially data storage (cloud storage) and computing power, without direct active management by the user. Large clouds often have functions distributed over multiple locations, each of which is a data center. Cloud computing relies on sharing of resources to achieve coherence and typically uses a pay-as-you-go model, which can help in reducing capital expenses but may also lead to unexpected operating expenses for users.