Google Analytics 4 audiences can now be used with third-party segments in Ad Manager. By accepting a third-party segment (cookies matching the demographics of your visitors bought via a third-party data provider), marketers can target line items to it, perform reports and run forecasts. Meanwhile, audiences can also be used as-is for targeting or, marketers can combine this data with other audiences to perform analyses. To access GA4 audiences in Ad Manager you need to follow these simple steps:Link your Analytics property to Google Ad Manager. Read Google's 'Sharing Audiences in Google Analytics' guide for more information.