To produce a smooth, even base, a primer is a makeup product that is applied to the skin before foundation and other cosmetics. Its main purpose is to make makeup stay on longer and cling to the skin more effectively. In addition to making makeup last longer, primers also help your skin look better by covering pores and small wrinkles to give it a more equal texture and tone. For instance, some primers have active components that aid to enhance the general well-being and condition of your skin.