What is the breathing organ of spider?

THE BOOOK LUNGS, I GUESS I JUST KINDA RESEARCHED AND THAT'S WHAT I THINK.. THE BOOOK LUNGS, I GUESS I JUST KINDA RESEARCHED AND THAT'S WHAT I THINK.. THE BOOOK LUNGS, I GUESS I JUST KINDA RESEARCHED AND THAT'S WHAT I THINK..