difference between aspect ratios?

wat the difference between aspect ratios? like sometimes when i convert a divx, it zooms in too much, i was wondering how i could keep it the way it is(the movie in widscreen, how do i keep it widescreen and the way it was) i always select the 1:1 VGA option. is that the right one? i live in the NTSC area. how do i find out which one to choose? i live in the USA by the way thanks!
 
In TMPGEnc, set the Source Aspect ratio to 1:1 VGA as you are doing, but select Video Arrange Method to be Full Screen (Keep Aspect Ratio) and you will get it exactly as the DivX was made.
 
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