Use topics to target or exclude placements in the Google Display Network based on the category into which the placement falls (for example, "Pets & Animals/Pets/Dogs").
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 Output only. The resource name of the topic constant. topic constant resource names have the form: 
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 Output only. The category to target or exclude. Each subsequent element in the array describes a more specific sub-category. For example, {"Pets & Animals", "Pets", "Dogs"} represents the "Pets & Animals/Pets/Dogs" category. List of available topic categories at https://developers.google.com/google-ads/api/reference/data/verticals  | 
              
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 Output only. The ID of the topic.  | 
              
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 Output only. Resource name of parent of the topic constant.  |