Lipstick is makeup that makes your lips look darker, redder, or shinier. Your French teacher might be famous in your school for her heart-shaped glasses and bright pink lipstick.
Some people like to wear lipstick every day, while others save it for fancy occasions. Most lipstick is a waxy, slightly creamy substance in a stick that's tinted with red pigment that colors your lips. It's a cosmetic that dates back at least to medieval times, and probably even farther back than that. In the 1600s, a fashionable look for upper class European women was a pale white face and bright red lipstick.