A type of
window that appears behind the
browser window of a Web site that a user has visited. In contrast to a
pop-up ad, which appears over (on top of) the browser window, a pop-under is less obtrusive as it hides behind other windows. Pop-unders are used extensively in advertising on the Web, though advertising is not the only application for pop-under windows.
A pop-under is also referred to as a pop-under ad.
See "How
to Deal With Pop-Ups" in the "Did
You Know..." section of Webopedia.