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[Google] Affiliate programs are not ad units or campaigns; they are ongoing programs that allow advertisers to reward publishers (or “affiliate partners”) for driving sales or conversions. While your AdSense ads are automatically targeted, you will select which Google Affiliate Network advertiser programs to join and then choose which affiliate ads to add to your site.
You may promote Google Affiliate Network ads on your site. If you endorse the product that you are referring, feel free to let your users know. By adding your personal review of the products you refer, you can help your users make more informed choices.
Note that you may not promote or call attention to AdSense ads in the same way.