Lip liner is a makeup product. It is used for outlining and defining lip line or contouring lips. It can be used alone or in combination with a lipstick or a lip gloss. Lip liners come in various colors, have different textures (dry, creamy) and finish. Matte lip liners are usually long lasting and prevent lipstick from bleeding. Glossy lip liners give dimension to lips and make them look fuller. Transparent lip liners have a subtle color or no color at all. They create an invisible barrier around lips and prevent lipstick from bleeding.