Variable Refresh Rate (VRR) is a technology that allows a display to adjust its refresh rate dynamically based on the frame rate output of a graphics card. This means that the screen can refresh more frequently when the frame rate is high and slow down when the frame rate drops, resulting in smoother visuals and reduced screen tearing. VRR is commonly used in gaming to enhance the experience by synchronizing the display's refresh rate with the graphics card's output. Technologies like NVIDIA G-SYNC and AMD FreeSync are popular implementations of VRR, providing gamers with a more fluid and responsive gameplay experience.