Eye-Tracking App in Action: A person holding up a smartphone with an eye-tracking app open on its screen. The app has a blue background and a yellow circle in the center, which is likely being used to track the user's eye movements. The person's eyes are focused on the phone as they move their head from side to side, demonstrating how the app can detect subtle changes in gaze direction. The image suggests that this technology could be useful for various applications, such as gaming or virtual reality experiences.