Geofencing lets your app react when a user enters or leaves a geographic area. Think delivery notifications ("Your driver is nearby"), attendance systems, location-based reminders, or smart home automation that turns on the lights when you arrive. Sounds simple. The reality? iOS and Android handle geofencing very differently under the hood, dwell detection is platform-specific, and your app might be suspended or killed before a transition fires. This guide walks through implementing geofencing in a Capacitor or React Native app using the bglocation plugin — from defining your first region to handling edge cases in production. What is Geofencing? A geofence is a virtual boundary around a geographic point. You define a center (latitude, longitude) and a radius in meters. The OS monitors the device's position and triggers events when the user: Enters the region Exits the region Dwells inside the region for a specified time Unlike continuous GPS tracking, geofencing is power-efficient.…