Wrinkles are folds or creases that form in the skin as a natural part of the aging process. They occur when the skin loses its elasticity and moisture, often due to factors like sun exposure, smoking, and genetics. As people age, the production of collagen and elastin, which help keep the skin firm and smooth, decreases, leading to the development of wrinkles. There are different types of wrinkles, including fine lines and deeper furrows. Moisturizers and sunscreens can help reduce their appearance, while more advanced treatments like botox or dermal fillers are available for those seeking more significant results.