Final answer:
GPS Tracking refers to the ability of smartphones to sense a person's location and movements.
Step-by-step explanation:
The ability of smartphones to sense a person's location and movements is referred to as GPS Tracking. GPS technology relies on an array of satellites orbiting the Earth, and GPS receivers detect signals from these satellites to calculate a person's position. This feature is widely implemented in smartphones and other mobile devices to aid in navigation and location-based services.