Google has launched an affiliate advertising network called Google Affiliate Network, earlier known as DoubleClick Performics Affiliate, which allows online publishers to get paid for every successful sale transactions that their websites bring to advertisers. Google acquired online advertising firm DoubleClick in March 2008. 

Through Google Affiliate Network, advertisers can open their ads to all publishers in the network, or select specific publishers that match their criteria. “Google Affiliate Network is currently a separate product from AdWords and AdSense,” Google has said, adding, “As with AdSense, publishers must apply and be accepted into the network.”