NVIDIA G-SYNC is a technology designed to enhance the gaming experience by synchronizing the refresh rate of a monitor with the frame rate of a graphics card. This helps eliminate screen tearing, stuttering, and input lag, resulting in smoother gameplay and more responsive controls. G-SYNC requires a compatible monitor and an NVIDIA graphics card. When both are used together, the monitor dynamically adjusts its refresh rate to match the output of the graphics card, ensuring that each frame is displayed as soon as it is rendered. This leads to a more fluid and immersive gaming experience.