Pop-under traffic is similar to pop-up advertising except the ad window that contains your chosen website / landing page will appear hidden behind the main web browser window rather than appearing in front, or in another tab depending on the visitors browser settings.
Pop up advertising is extremely common and many users have quickly learned to ignore these advertisements and just close the page without reading them as they are generally considered intrusive, annoying and un-related to what they are viewing already.
Visitors react better to pop under advertising as the ads do not impede the user’s ability to continue reading the website they are currently on, and once finished with that particular piece of content they will view the intended ad in their own time and be more inclined to read the ad and make a decision based on the content rather than automatically closing it like a pop up.
How Will My AD Look?
Your website will be displayed inside a full page pop under window, this is essentially a new tab displaying the website URL you entered when ordering.
If you visit your URL and press F11 on the keyboard you will see close to what a visitor would see (there would be a X button and url field).