Key Performance Indicators (KPIs) for push notification ads help measure the effectiveness of campaigns and user engagement. The most important KPI is the Click-Through Rate (CTR), which shows how many users interacted with the notification. Open Rate is also critical, indicating how many recipients opened the app after receiving the push. Conversion Rate measures how many users completed a desired action, such as making a purchase or signing up. Other essential KPIs include Delivery Rate, which reflects how many notifications reached users, and Opt-out Rate, revealing user tolerance for push campaigns. Monitoring Retention Rate post-notification helps assess long-term impact. Together, these KPIs guide optimization efforts and ensure push notifications remain relevant, timely, and non-intrusive for the target audience.