What is a tale told by an idiot full of sound and fury signifying nothing?

This famous quote comes from Shakespeare's play Macbeth, where Macbeth, filled with guilt and remorse after killing King Duncan, describes the meaninglessness and transience of life. The quote is referring to life itself as a meaningless story, full of noise and commotion, but ultimately leading to nothing substantial or lasting. It reflects the existential crisis and despair felt by Macbeth as he grapples with the consequences of his actions.