Why do diapers smell like baby powder?

My brother has taken up buying me a bag of diapers every time he gets groceries, and I have a size 3 bag currently. Size 2 was out, so he just went the next step up. Not a problem, they'll last until she's large enough to wear them, but I was curious. You smell them, and they have this baby powder scent. Now, diapers don't exactly have an indgredients list on them, so I can't verify if it's actual powder, or some form of fragrance they put in to help them smell better. Anyone know?

I did note, however that these butt huggers were proudly made in the USA :)