Target your visitors, set your budget and control your rates are just few of your high quality advantages of becoming a Pop Ads advertiser.
A variation on the pop-up window is the pop-under advertisement, which opens a new browser window hidden under the active window. Pop-unders do not interrupt the user immediately and are not seen until the covering window is closed, making it more difficult to determine which web site opened them
Pop-under ads are similar to pop-up ads, but the ad window appears hidden behind the main browser window rather than superimposed in front of it. As pop-up ads became widespread and took up whole computer screens, many users immediately close the popup ads that appeared over a site without looking at them. Pop-under ads do not immediately impede a user's ability to view the site content, and thus usually remain unnoticed until the main browser window is closed or minimized, leaving the user's attention free for the advertisement.