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Push notification
A short message from an app that appears outside it.
A push notification is a system-level message — a banner at the top of the phone, an item on the lock screen, a sound. It lets an app reach the user without them opening it: a chat message, a delivery update, a daily reminder.
Push is powerful and easy to abuse. Send only what the user actually wants. Group related notifications, link each one to the right screen inside the app, and let users mute categories without disabling everything.