Ad that is displayed in a new browser window that appears under the already-open window.
An advertisement that appears behind an open browser window.
A small box of text and graphics that pops under a web page. You'll see a pop-under ad after you've closed your web browser. Like popups, these ads are controversial. Many website visitors consider them to be an annoyance.
Ad that displays in a self-generating new browser window behind the current browser window.
ad that appears in a separate window beneath an open window. Pop-under ads are concealed until the top window is closed, moved, resized or minimized.
A pop-under is a form of online advertising and is displayed in a new browser window behind your current browser window.
A variation on the pop-up ad, this online ad displays in a new browser window behind the user's current browser window.
Ad that appears in a separate window beneath an open window. (Source: IAB)
Online advertising that displays in a browser window behind the window a user is currently viewing.
Ad that appears in a separate window on top of or beneath content already on-screen. Pop-under ads are concealed until the top window is closed, moved, resized or minimized.