What is the difference between GPS and geofencing?

There are two main differences between GPS and geofencing. First, GPS is able to track a person or object’s location in real-time, while geofencing only allows for tracking when an object enters or leaves a predefined area. Second, GPS requires a direct line of sight to satellites in order to work, while geofencing can work even when there is no direct line of sight, as long as there is a strong enough cellular or WiFi signal.