Popdown

An ad presented in a separate browser window that opens automatically when the visitor enters or leaves a certain web page. A pop-down window opens under the page that the visitor is on.

Like a pop-up, the pop down also achieves a higher click rate than banners, and it is also considered to be much more aggressive and invasive. Yet, unlike pop-ups, the pop-down window opens underneath the page that the visitor is on.

Many programs, including Explorer, have been developed to automatically block out these programs.