Why do wasps leave their stinger?

Wasps do not leave their stingers behind when they sting, unlike bees. Their stingers are smooth and can be used multiple times, allowing them to sting multiple times without losing their stinger. This adaptation helps them defend their nests and capture prey more effectively. In contrast, bees have barbed stingers that become lodged in their target, leading to their death after a single sting.