As far as I know, cloud services such as SharePoint Online in Office 365 can be an attractive alternative to on-premises SharePoint business solutions, but for a variety of reasons, you might need to deploy specific solutions in the cloud while still maintaining
your on-premises SharePoint farm. New functionality in SharePoint Server 2013 and SharePoint Online enables you to integrate services like search, Business Connectivity Services, and Duet Enterprise Online across the on-prem/cloud boundary.
Here is an article introduced it, we can refer to :
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.