How do I target specific customer segments with Shopify popups?

To target specific customer segments with Shopify popups, pick a popup app like Justuno or OptinMonster that lets you filter audiences. Then, create segments based on behavior, like past purchases, cart value, or location so your popups reach the right people. Customize the message for each group, like offering loyal customers an exclusive deal or reminding cart abandoners about their items. Test different designs and timing to see what works best.