The technology primarily used for location tracking in smartphones is Global Positioning System (GPS). GPS utilizes a network of satellites that transmit signals to GPS receivers, allowing devices to determine their precise location anywhere on Earth. This technology enables various applications, including navigation, geolocation services, and location-based services. Smartphones also combine GPS with Wi-Fi positioning and cellular triangulation for enhanced accuracy, especially in urban environments. By accurately pinpointing locations, GPS supports a range of functionalities, improving user experiences across diverse applications, from mapping to ride-sharing services.