Audience segment categories
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Categories allow you to organize and filter your audience segments by common themes (e.g., Demographics, Geographics, Interest, etc.). You can assign categories to your first-party audience segments within the Ad Manager UI, and categories may already be included in segments from data providers.
When applying audience segment targeting to Ad Manager line items, you can filter the available segments by categories to simplify the trafficking process. The available categories for audience segments are displayed within the Ad Manager UI under the segment category picker. To retrieve a current list of all available categories, developers can use the PublisherQueryLanguageService within the Ad Manager Publisher API.