Vertical synchronization (v-sync) refers generally to the synchronisation of an event with the vertical blanking interval. Generally video displays are refreshed sequentially and on older CRT based displays, a short delay is required between updating the lowest horizontal line of the display and returning to refresh the highest. This delay, which is preserved by more modern display equipment, gives an opportunity in computer graphics to alter the contents of a framebuffer without visible graphical errors such as partially redrawn graphics or page tearing (when the top part of the display shows part of one frame and the bottom part shows of another).
And no, we can't give screenshots because it has to do with the way things are presented in motion on your monitor, nearly impossbile to capture. Why don't you try a few games with vsync on and off, you definitly have a capable system.