Mascara is a special kind of makeup that grown-ups use to make their eyelashes look darker and longer. You know how your hair on your head can get tangled or messy? Well, sometimes the eyelashes can get clumped together or messy too. That's why mascara comes in big tubes with a brush on the end. Adults carefully use the brush to put the mascara on each of their eyelashes, making them look more beautiful. Some mascaras have special ingredients that make the eyelashes look even thicker or curly. When they're done, they look amazing and ready to go out and have fun!