Hybrid SharePoint environments combine on-premises Microsoft SharePoint Server 2010 with Office 365 — Microsoft SharePoint Online
Overview
Hybrid environments enable organizations to achieve a higher degree of flexibility than forcing a choice between either an on-premises or cloud model. Organizations can start to achieve the benefits associated with the use of cloud computing coupled with the customization flexibility and tight data governance of an on-premises system, while delivering a consistent experience to users.
Aryan Nava 