Your skull is the bony structure that forms your head and protects your brain. Think of it as nature's helmet: a hard, rounded case made of bone that keeps your brain safe from bumps and falls. Without your skull, even a minor accident could cause serious brain damage.

The skull isn't one solid piece. It's actually made up of 22 different bones that fit together like a complex 3D puzzle. Most of these bones are fused together at wiggly lines called sutures, which you can sometimes feel if you run your fingers carefully over your head. Your skull includes your jaw, the bones around your eyes, and the dome that covers your brain.

The word skull can also refer to the skull and crossbones symbol: a white skull with two crossed bones beneath it. Pirates famously flew this symbol on their flags to frighten other ships into surrendering. Today, you might see it on warning labels for poisonous substances.

Scientists and doctors study skulls to learn about health, history, and even how people lived thousands of years ago. Archaeologists can examine ancient skulls and determine what someone ate, how old they were, and sometimes even what caused their death. Your skull also provides structure for your face and anchors your teeth, making it essential for eating and speaking.