TrueView in-display ads run on:
- YouTube homepage, channels, watch pages, and search results, and the Display Network
- YouTube videos and search results, and the Display Network
- YouTube watch pages and Masthead ads, and Google search results
- Google TV, Google search results, and the Display Network
TrueView video discovery ads can run across YouTube and Google Display Network. On YouTube they can run on the search results and watch pages for both desktop and m.youtube.com, as well as the homepages for desktop and YouTube mobile apps. The ad unit consists of an image thumbnail and up to three lines of text.
Your ad consists of a thumbnail image from your video with some text.The ads appear on YouTube search results, Alongside related YouTube videos and On the YouTube mobile homepage. You are charged only when viewers choose to watch your ad by clicking the thumbnail.
Read more here: https://support.google.com/adwords/answer/2375464?hl=en
trueview video discovery ads run on