Push notifications are one of the most effective ways to bring users back to your app — for order updates, offers, reminders, or announcements. We typically integrate Firebase Cloud Messaging (FCM) for this, which works reliably across Android and iOS. Best practice: don't over-notify (it leads to uninstalls) — focus on genuinely useful, timely notifications tied to real user actions (order shipped, appointment reminder, exclusive offer). We can also set up segmented notifications, so different user groups receive relevant messages rather than one blanket broadcast to everyone.