G-Sync is a technology developed by NVIDIA that synchronizes the refresh rate of a monitor with the frame rate of a graphics card. This helps eliminate screen tearing and stuttering during gaming, providing a smoother visual experience. By dynamically adjusting the monitor's refresh rate, G-Sync ensures that frames are displayed as soon as they are rendered. This results in more fluid motion and improved responsiveness, making it particularly beneficial for fast-paced games where every millisecond counts.