Get to know Alpha Hydroxy Acid (AHA) and Beta Hydroxy Acid (BHA):

AHAs (like glycolic and lactic acids) gently exfoliate the skin, improving texture and helping to diminish the appearance of wrinkles and hyperpigmentation.

BHAs (like salicylic acid) are better for blemish-prone skin, since they can penetrate  oil to help clear clogged pores.