Cave is a natural underground space or chamber formed within rock. Some caves are large enough to walk through, while others are small and narrow. Caves may have features such as tunnels, chambers, and rock formations. They are often dark and cool inside.

Caves are found in many parts of the world, especially in areas with limestone rock. They formed over long periods of time. Caves are used by animals such as bats and insects. In some places, humans have used caves for shelter or exploration.