Let’s say you’re printing a single page. To make it pretty, you want the margin to be nice and even around all four sides, right?
Now, if you’re printing double-sided, you’re presumably printing something that will be bound/stapled/whatever together into a booklet of some sort. If your margins are nice and even, the edge along which you bound the sheets of paper together will look smaller than the others. If, instead, you make that margin slightly larger than the others, it’ll look even after you bind it.
What the printer dialogue is asking you is: which side are you going to bind this on, so I know which margin to make wider?
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