CPM stands for “cost per 1000 impressions.” Advertisers running CPM ads set their desired price per 1000 ads served, select the specific sites on which to show their ads, and pay each time their ad appears.
Today we got something interesting here, which you might sure be interested. Not all Google Adsense Ads require clicks to make extra money quickly for you.
If you analyze reports, you may have seen earnings without any clicks. This is because many ads are CPM ads for which advertisers pay you money per 1000 ad impressions.
CPM ads in Google Adsense compete against pay-per-click (or CPC, cost per click) ads in the ad auction, so only the highest performing ads will be served to your pages.
If an advertiser wants to specifically target your site, they will need to bid high enough to beat out the CPC ads that are already in the auction in order to show up on your page. Google pays you each time a CPM ad is shown on your page. But you won’t earn additional revenue for clicks on these ads.
CPM ads can be either text or image ads, and are always site-targeted. CPM text ads will expand to take up the entire ad unit.
The Google Adsense ad auction and smart pricing are too complex for us to deal with, lets leave it to Google at best. For more information, visit Adsense support. Till then you might look at How to Optimize Adsense Units using 8 Excellent Tips and How to Increase Google Adsense Effective CPM rate. Do comment about your reviews on this article.