Notebook is the name of the presentation software that comes with the SMART Board itself. While any interactive whiteboard can be used simply as a giant touch screen, it is the Notebook software that enables you to take notes, create interactive learning activities, and complete a multitude of other learning activities.
My Version of Notebook Looks Different
Since this video was first posted, the Notebook software has undergone several revisions. The video comes from the official SMART Classrooms YouTube Channel though. It is one of their earlier videos, and it is still valid. The graphics may be slightly different, but everything else is the same.