A Popunder ad is a kind of full-screen window opening at the back of the browser window of a site. Contrary to the famous popups opening over the browser window, this is less conspicuous. A popunder ad is located at the back of the windows, which makes popunder ads a very efficient tools for media buyers.
For instance, when you visit a site with this type of ad, the Popunder will show up in a new browser window hidden under the existing browser of the user. You will notice the pop-under ad when you close your existing browser. This type of ad makes them less intrusive and much acceptable to users. On top of that, it will not take visitors away from the site of the publisher.
One of the best things about the Popunder network is that it offers advertisers an excellent chance to market their products and services while offering the users enough product details. It also offers advertisers with no creatives to utilize any landing page in their site as a Popunder site.
This is the main reason why Popunders are widely utilized for marketing on the web.