Dark circles refer to the discoloration that appears under the eyes, often giving a tired or aged appearance. They can be caused by various factors, including lack of sleep, genetics, and aging. Many people seek cosmetic solutions to reduce the visibility of dark circles, which can include creams, serums, and makeup products. Cosmetic products designed to address dark circles often contain ingredients like caffeine, vitamin C, and hyaluronic acid to brighten the skin and improve hydration. Additionally, concealers are commonly used to cover dark circles, providing a more even skin tone and a refreshed look.