Private cloud
Private cloud has the same basic features of public cloud, with the difference that is a solution dedicated to a single company: the cloud infrastructure is owned by the organization, which has the exclusive and total control of data and resources. Usually this kind of service is managed by the IT staff of the company, therefore IT infrastructure and specialized personnel costs are not eliminated.
So the main difference between public and private cloud solutions is related to the data positioning, that could be allocated in places owned by the company or in a data center, and especially to the higher security, useful for businesses that handle sensitive data.