Which type of Google audience should an advertiser attempt to reach if they're trying to attract new customers who think like current customers?

Similar audiences are designed to help advertisers find new users who resemble an existing audience source, such as website visitors or customer lists. In current Google Ads documentation, the comparable concept is Lookalike segments, which reach people who share characteristics with a seed list. This makes the audience type appropriate for prospecting when the goal is expansion beyond existing customers. It is built for similarity-based acquisition rather than re-engagement or immediate purchase-intent targeting