Eyeliner is a cosmetic product used to define and enhance the eyes. It comes in various forms, including pencil, liquid, gel, and cream. Eyeliner is typically applied along the upper and lower lash lines to create different looks, from subtle definition to bold statements. It can be found in a range of colors, with black and brown being the most common. Many people use eyeliner as part of their daily makeup routine or for special occasions. It can help make the eyes appear larger or more dramatic. Different application techniques, such as winged eyeliner or tightlining, allow for creative expression in makeup artistry.