Cartilage is like the squishy part on the end of your nose or your ear. It helps your body move and protects your bones from rubbing against each other. When you move, your cartilage gets squished like a sponge, but it bounces back into place when you stop moving. It's kind of like a soft pillow between your bones that helps them move without hurting each other. Cartilage is also important for babies to grow because it helps their bones form and become strong.