Eyeliner is a cosmetic used to open up and define the eyes by tracing their shape. There are a variety of different types of eyeliner on the market, including pencil eyeliner. liquid eyeliner, gel eyeliner, powder eyeliner and cream eyeliner. The classic color for eyeliner is black, but it comes in as assortment of shades including brown, purple, blue and green.http://www.sephora.com/browse/section.jhtml;jsessionid=1O20RGDVEL3D4CV0KQRQQAQ?categoryId=S10505&_DARGS=/browse/templates/level_three_assortment.jhtml

Experts advise that eyeliner not be overdone, and the lines should not be too dark or harsh in order to avoid an unflattering look. The method for applying eyeliner will depend on the type of formula used, as liquids behave differently than powders and so on.http://beauty.about.com/od/allaboutyoureyes/a/eyelinertips.htm

Eyeliner is used to achieve a variety of makeup looks. These include:

• The smokey eye look: This look uses darker colors that are smudged and blended together. Both eyeliner and eyeshadow are used to complete a smokey eye effect.http://beauty.about.com/od/allaboutyoureyes/a/eyelinertips.htm
• The dramatic eye: The dramatic eye is primarily an evening look, and it can make a bold statement. Darker colors are used for this effect, which typically calls for a liquid liner or even a dark eyeshadow applied with precision.http://beauty.about.com/od/allaboutyoureyes/a/eyelinertips.htm
• Cat eyes: The cat eye look is used to make the eyes appear similar to those of a feline in shape. This is a somewhat heavily made up look, and requires a bit of precision. In a cat eye look, the eyeliner is applied in such a way that it spans out from the outside corner of the eye to curve up and form a point.http://www.temptalia.com/tutorial-cat-eye-liner-liquid-liner-tips-neutral-eye