A content network is generally present with all major search engines as a part of their paid search interface. While they generally don’t have a designated name, Google has renamed theirs to Google Display Network. As a part of Google AdWords, advertisers can perform the following functions using content networks; they can either choose the sites they want their ads to be displayed on or opt for contextual advertising as per which they can use keywords which will then be associated with your ads, thus displaying them whenever a related web page appears in the search results.