SharePoint Developer Interview Question:

Tell us what are Callout Popups in SharePoint 2013?

Submitted by: Muhammad

Similar to Dialog framework in SharePoint 2010, Microsoft has added a new Callout Popup framework to Create Hover Popups that you know as Preview Windows as well. These NotificationTooltipHelp (whatever you call it..) Callout Popups can be fully Customized to add Custom Text & Actions for guiding End-users.
Submitted by: Muhammad