Interstial stands in German for interstitial, which means in between. In terms of banners and the large-scale interstitial banner, an interstitial banner is a pop-up banner that is placed in between or on top of a web page
and covers the entire browser window. Interstitial banners are triggered by a page change or
on abutton or a hotspot. The interstitial banner is placed on the browser window after opening and covers the browser
for a certain period of time. In some versions, it cannot be clicked away, but disappears automatically after the set period of time. The banner itself can be animated or work as Flash.