In-stream ads are video ads that play ‘in-stream’, i.e. while the user is watching content via a video player online. In-stream ads can appear in a full-screen view before (pre-roll), during (mid-roll), or after (post-roll) content. They can also appear as a 6-second bumper ad. See also, Pre-Roll, Mid-Roll, Post-Roll, and Bumper Ad.