What are in-display video ads?

We have a video by Anja where she discussed what in-display ads are and when to use it.

Watch it here: https://www.youtube.com/watch?v=_B90aBL5eO0

Here's a detailed post we published about in-display ads:

http://blog.veeroll.com/how-to-get-started-with-in-display-video-ads/