Pencil eyeliner is a cosmetic product used to define and enhance the eyes. It comes in a pencil form, making it easy to apply and control. Available in various colors and finishes, such as matte and shimmer, pencil eyeliner can create different looks, from subtle to dramatic. To use pencil eyeliner, you simply sharpen the tip and draw along the lash line. It can be used on both the upper and lower lids. Many people prefer pencil eyeliner for its convenience and versatility, as it can be easily blended or layered for a more intense effect.