Lightning rod for controversy

What does "the lightning rod for controversy" means? Does it means the focus of a controversy or the shield that avoid a controversy?

I'm an English learner. If there's any mistake in my sentences, please point it out.

It means someone or something that attracts or draws controversy.

From Merriam-Webster:

Main Entry: lightning rod
Function: noun
1 : a grounded metallic rod set up on a structure (as a building) to protect it from lightning
2 : one that serves to divert attack from another or as a frequent target of criticism