Answer: If the question is "What information is used to identify similar audiences?" then please look at the explanation below for the answer.
Explanation: Similar audiences is a type of targeting feature that looks at remarketing lists, to help grow the reach of your existing audience, by targeting new users who have similar characteristics to the best performing audiences who already visit your site.
Diana makes use of Google Ads to identify similar audiences. Google ads views millions of individuals who use Google's search engine. Google Ads will then look at a variety of factors that she constructed and will then identify which of her remarketing lists actually qualify for similar audiences using these factors. This will occur automatically.