Danger is the possibility that something bad or harmful could happen. When you see a “Danger: Thin Ice” sign at a frozen pond, it warns that the ice might crack and you could fall through. When a weather forecast predicts dangerous thunderstorms, it means lightning, high winds, or flooding could hurt people or damage property.

Danger exists in different degrees. Crossing a busy street without looking is dangerous. So is climbing a tall tree without checking whether the branches are sturdy. Some dangers are obvious, like a snarling dog or a fire. Others hide until you're close, like a weak floorboard or a slippery patch of oil.

People often confuse danger with fear, but they're different. True danger means actual risk of harm: something that can hurt you or cause damage. A harmless garden snake might scare you, but it poses no real danger because it can't hurt you. Meanwhile, carbon monoxide gas is extremely dangerous even though you can't see, smell, or feel it, because it can cause serious injury or death.

When someone is in danger, they face potential harm right now. When something is dangerous, it has the power to cause harm. A danger zone is an area where risks are especially high. Understanding danger helps you make smart choices: sometimes you avoid it, sometimes you prepare carefully before facing it, and sometimes you accept small dangers to accomplish something important.