Between-the-page

Also known as “interstitial” ads, between-the-page ad units display as a user navigates from one webpage to the next webpage. The ad appears after the user leaves the initial page, but before the target page displays on the user’s screen. Typically, the ad is self-contained within its own browser window or app environment, but may also appear briefly as an overlay on the target page rather than in its own browser window. (see also: Prestitial)