Private Cloud: is a particular type of cloud computing that involves a distinct and secure cloud based environment in which only the specified client can operate. As with other cloud models, private clouds will provide computing power as a service within a virtualised environment using an underlying pool of physical computing resource. However, under the private cloud model, the cloud (the pool of resource) is only accessible by a single organisation providing that organisation with greater control and privacy.
Unlike public clouds, which deliver services to multiple organizations, a private cloud is dedicated to a single organization.
As a result, private cloud is best for businesses with dynamic or unpredictable computing needs that require direct control over their environments.