description Google Firebase Cloud Messaging (FCM) Overview
FCM is not a geofencing tool itself, but it is the critical *delivery mechanism* for geofencing alerts. Once a backend service (like AWS or Firebase Functions) detects a boundary crossing, it uses FCM to reliably push a notification to the user's device. It is essential for ensuring that the user is alerted immediately and reliably, regardless of whether the app is in the foreground or background.
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