Similar Audiences refers to the audiences automatically generated inside the Adwords platform from Audiences you have previously defined that contain 5,000+ cookies. These are a fantastic way to expand the reach of your message to new people who share similar characteristics to those who you already know.
Similar Audience targeting leans on Google’s enormous cookie database to find users (ie. cookies) that demonstrate similar characteristics to the cookies found in your seed (5,000+ member) Audiences.
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