A Head-Up Display (HUD) is a technology that projects important information onto a transparent screen in the user's line of sight. This allows users to view data without looking away from their primary focus, such as the road while driving. HUDs are commonly used in vehicles, aircraft, and even in some video games to enhance situational awareness. HUDs can display various types of information, including speed, navigation directions, and alerts. By keeping critical data visible, they help improve safety and efficiency. Many modern cars and aircraft are now equipped with advanced HUD systems that utilize augmented reality to provide a more interactive experience.