A type of advertisement that is automatically displayed in a second smaller browser window behind the current window apon loading or unloading a normal web page. Pop behind advertisements tend to cost advertisers more since their visibility is higher but are considered less annoying than pop ups by web site visitors.
A window that pops (launches automatically) behind the current browser window. Also known as a pop-behind or go-behind
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 minimised.
A pop up that loads under a page so that it is only viewable once the current page is closed.
A window that automatically loads underneath the page that is currently being viewed so that it is only viewable when the current page is closed.
A "pop" in internet marketing terms is an advertisement that opens a new browser window or tab on the users computer. A popunder opens is a new browser screen that pops behind your current browser window (thus pop under). It is initiate via Javascript code loaded when the user views a page on the site. (aka popunder)