ads displayed through links on the websites affiliated to Google Ad service. It is a contextual ad. 
                                Adwords
                Solution of sponsored links by Google. 
                                Affiliation
                Partnership or exchange system to connect a Web merchant site to other sites with a guarantee of compensation. 
                                Audience mesurement
                Website�s traffic analysis. It provides information about traffic, traffic sources, navigation, Net surfers�
  
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