What is geofencing on a cell phone?

Geofencing is a location-based service that uses GPS to fence in a geographical area. When a user enters or leaves the area, they receive a notification on their cell phone. This can be used for a variety of purposes, such as keeping track of children, monitoring employees, or tracking company assets. Geofencing can also be used for marketing purposes, such as sending coupons to customers when they enter a store.