A retargeting list is a curated segment of users who have previously engaged with a brand but did not complete a desired action, such as purchasing. Businesses use retargeting lists to serve personalized ads and reminders across platforms like Google Ads, Facebook, and LinkedIn. These lists are built using CRM and website tracking tools, which monitor user behaviors like page visits, cart abandonment, and content engagement. Retargeting lists help businesses re-engage potential customers, increase conversion rates, and optimize advertising spending by focusing on high-intent users.