Skyhook is a technology that allows for the precise location of devices using a combination of GPS, Wi-Fi, and cellular signals. It enhances location accuracy by utilizing nearby Wi-Fi networks and cell towers, making it particularly useful in urban areas where GPS signals may be weak or obstructed. This system is often used in mobile applications and services, enabling features like location-based services and navigation. Companies like Google and Apple incorporate Skyhook technology to improve user experiences by providing more accurate location data, which is essential for various applications, including mapping and ride-sharing services.