What is lightning? Why does wearing rubber shoes help you during a storm?

What is lightning? Why does wearing rubber shoes help you during a storm?

Lightning is a discharge of atmospheric electricity which is triggered by a buildup of differing charges within a cloud.

because rubber is insulator, and insulator can help us to keep the electric away from the body.
So when you wearing rubber shoes during a storm, you won't get conduct, because rubber shoes can help you keep charged away from your body.