A liquid eyeliner is a type of eye makeup applied using a precise and thin applicator brush that comes with the liquid eyeliner bottle. It is said to be the hardest eyeliner to apply because it requires a steady hand. It takes time, care, and a lot of practice in front of the mirror. It is applied on the upper and outer eyelids to outline and accentuate the eyes. It can make the eyes appear bigger, smaller, set wider apart, or nearer depending on the application. Compared to the other types of eyeliner, it is the most precise and intense in forming lines.