Head-Mounted Displays (HMDs) are wearable devices that provide immersive visual experiences. They are commonly used in virtual reality (VR) and augmented reality (AR) applications, offering users a first-person perspective with high-resolution displays and motion tracking. HMDs can be used for gaming, training simulations, design visualization, and remote collaboration. Advances in HMD technology have improved display quality, comfort, and interactivity, making them essential tools for various professional and entertainment applications.