Google Adsense, in a way to improve the revenue for publishers has introduced an image ad at the bottom of the page that one would get after clicking on any Adsense link unit topic.
As in the above image, an image ad will appear on each page that users see after clicking on any link unit.These image ads are contextually targeted as well, and can be either CPC (Cost Per Click) or CPM (Cost Per Impressions).
P.S: Adsense publishers are strictly prohibited from clicking on their own ads, so never click on your own Ad link unit to see this new feature.[Of course, you always have other ways to test this 🙂 ]