A monetized playback occurs when your video is being served with at least one ad while someone is watching it. Ads are not shown every time someone watches your video. The monetized playbacks, therefore, show you the number of views where an ad was shown and are always lower than your total view count. The following types of videos are not eligible to monetize with ads:
- Videos that violate YouTube's monetization policies
- Videos with third-party claims
- Videos set as private
Determining factors that contribute to whether or not an ad is shown include the genre of the content, location and language, and audience demographics amongst other things. If ads aren't showing up on all of your content, there might be an issue. Please visit YouTube Help Center for more information.