A Hybrid Cloud solution, is one that uses both traditional ‘on premise’ servers for some applications, whilst hosting others off site in a secure data centre. Those servers could be your own servers that you store in a datacentre but that you personally own, or they could be virtual servers, hosted on the datacentre’s own infrastructure.
Typically organisations using a Hybrid Cloud solution will keep some servers on their own premises, for key applications, or applications that cannot be hosted, whilst using cloud based services for commodity applications such as email.
As an example, you may choose to have on site servers for your data storage, your accounts application and your key CRM databases, whilst accessing SharePoint, Email, Exchange and documents via the cloud.