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Eyeliner is a cosmetic product designed to enhance and define the eyes, belonging to the broader category of beauty and eye makeup. It typically comes in various forms such as pencils, liquids, gels, or creams and can be applied along the upper and/or lower lash line to create a variety of looks, from subtle and natural to bold and dramatic. Eyeliner can also be used to create the illusion of larger or more defined eyes. The application process requires precision and skill, but with practice, it becomes an essential tool in any makeup routine.