If you buy the products airbrushing is used to advertise, you won’t look like the person in the photograph.
It’s used to smooth lines, hide blemishes, lighten skin, slim features, lengthen limbs, and brighten eyes and teeth.
It exists to sell a fantasy to the consumer that this “perfection” is indeed possible. If you have yet to achieve this beauty standard, it tells you, you should buy some expensive products immediately, because then you will look like the person in the photo. (But, as I said just a moment ago, you won’t.)