- On the Web, a pop-under is a window that is created but temporarily "hidden" behind the window of a Web site that the user has chosen to visit. When the visitor leaves the site that was being visited, the pop-under window becomes visible. Pop-unders are generally used for advertising. Although some users find pop-unders to be intrusive, advertisers generally report good results.
LAST UPDATED:
21 Sep 2001
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