V-Sync, or Vertical Synchronization, is a technology used in video games and computer graphics to prevent screen tearing. Screen tearing occurs when the frame rate of a game exceeds the refresh rate of a monitor, causing images to appear disjointed. V-Sync synchronizes the frame rate of the game with the monitor's refresh rate, ensuring smoother visuals. When V-Sync is enabled, the graphics card waits for the monitor to be ready before sending a new frame. This can lead to a more stable gaming experience, but it may also introduce input lag or reduce frame rates in some situations, particularly if the graphics card struggles to keep up.