Makeup primer is a cosmetic product applied to the skin before foundation and other makeup. Its primary purpose is to create a smooth base, helping makeup to adhere better and last longer. Primers can also help to minimize the appearance of pores and fine lines, providing a more even skin texture. There are various types of makeup primers, including those designed for specific skin types, such as oily, dry, or combination skin. Some primers contain additional benefits, like hydration or oil control, while others may include SPF for sun protection.