Layer ads are special banners that overlay an open browser window. Translated, the term Layer-Ad means layered ad. Unlike pop-up banners, layer ads do not open a new browser window.
Layer ads can be animated Flash banners or DHTML banners, they appear frameless and also transparent and lay over the opened web page. Layer ads attract a lot of attention, but also cause a high " click away" rate.
Layer ads are often a nuisance for the Internet user because they open automatically and in some versions cannot be clicked away or can only be clicked away with difficulty because the closing function is hidden. Some layer ads close automatically after a certain time.