A non-intrusive interstitial ad, pop unders work similar to a pop up ad but the ad displays in a new window under the current browser window without intruding on the user. Users are more likely to stay with the pop under ad without clicking away. Users are led to a pop under landing page from high-quality advertisers without clicking a link
User engages with any area of your site.
An advertiser page opens in a pop under window.
Your earning increase with user interaction with the ads.