Outstream video ads are ads that appear in a video player within the body of your page content or article. The video ad does not precede video content.

For example, if you are a news publisher, you might have a text-based article that contains a video player between paragraphs.  As the reader scrolls through the article, the outstream video ad is triggered and plays when they reach the previous paragraph. This video player collapses as the user scrolls away.