clipped from: www.gfanatic.com You earn through AdSense on a pay-per-click basis. Google will first display relevant ads to the article the Ads appear. If the article is about flowers, then most likely the ads from AdSense are about flowers too. If it is about computers, most of the ads will also be about computers. Once one of your visitors clicks an ad, you get a commission from that click, and also Google gets something too.