Layer Ads are very popular advertising method these days as they are really efficient in catching attention easily.  

They appear whenever a visitor visits a site that contains a Layer-Ad code but are not seen as pop-ups and therefore are not blocked by browsers. 

The big advantage with layer advertisements is that they reaches 100% viewing and have proven themselves best when advertisers want quick attention and action.

You can attach an advertisement to your Layer-Ad, or you can just provide a landing page. Layers-Ads are paid per view and not per click. For every single country, there are CPM prices.