Google Ads allow audience targeting based on user interests or affinity groups. This is inferred using past Google searches and pages visited. An advertiser can

Google Ads allow audience targeting based on user interests or affinity groups. This is inferred using past Google searches and pages visited. An advertiser can add as many of these groups as they want to a campaign and get visibility into their visitors' interests. https://support.google.com/google-ads/answer/2497941?hl=en https://support.google.com/google-ads/answer/2497941?hl=en