Red is a bold, warm color that sits at one end of the rainbow, beyond orange. It's the color of ripe strawberries, fire trucks, and stop signs. Red stands out more than almost any other color, which is why it's used for warnings and alerts: stop lights, emergency buttons, and danger signs all rely on red to grab your attention instantly.

Red carries powerful associations. It can signal danger or excitement, love or anger, depending on the context. A red rose symbolizes romance, while a red face might show embarrassment or fury. When someone “sees red,” they're so angry they can barely think straight. Athletes often wear red to look more confident and assertive.

The color appears throughout nature and culture. Cardinals flash red feathers in winter snow. Red blood cells carry oxygen through your body. Many countries feature red in their flags. Red carpets welcome VIPs to special events, and a “red-letter day” means something important and exciting is happening.

Artists and designers know that red makes things feel closer, warmer, and more urgent than cool colors like blue or green. A red shirt in a crowd catches your eye before a gray one does. That's why sale signs are usually red: they want you to look.

As a noun, red can also mean the color itself: “My favorite color is red.”