What is meant by the term "cell renewal"? | Sally Beauty

What is meant by the term "cell renewal"?

The cells of the top layer of skin (epidermis) are in a constant process of regeneration or renewal. New cells are formed in the bottom (basal) layer of the epidermis and make their way to the skin's surface where they are shed or exfoliated. Shedding old skin cells stimulates the formation of new skin cells. Thus, products that exfoliate and remove old skin cells speed up the process of cell renewal.