Engagement data helps you track how much or how little of your videos your viewers are watching. Using heat maps, you can see how much of your video was watched, re-watched or skipped. You can see this data for individual viewers or consolidated data for all viewers.
The individual viewer graphs represent the timeline of your video and the viewer's attention span for each section. The colors represent how many times that section of the video was consumed. White sections were not watched, green sections were watched once, and yellow and red represent progressively more views.