Push Notification

Definitions

1. A message sent from a server to a user's device that appears even when the app isn't open. Delivered via APNs (Apple Push Notification service) on iOS and FCM (Firebase Cloud Messaging) on Android. Requires user opt-in, and abuse (too many, irrelevant, or poorly timed notifications) leads to high opt-out rates. Silent pushes trigger background work without alerting the user.

   In plain English: Messages from apps that pop up on your phone screen even when you're not using the app.

   Example: "Send a push notification when the order ships, not when something is added to the cart -- relevance determines whether users keep notifications enabled."

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