Act III of Macbeth marks a turning point in the play where Macbeth's ascent to power begins to unravel, showcasing themes of ambition, guilt, and betrayal.

In Act III, Macbeth's character is further developed as his paranoia grows, leading him to commit more heinous acts to secure his power, illustrating his moral decline.

Key events in Act III include Macbeth's hiring of murderers to kill Banquo and Fleance, the banquet scene where Banquo's ghost appears, and Macbeth's increasing instability.

Act III highlights the theme of power by showing Macbeth's desperate attempts to maintain control through violent means, emphasizing the corrupting nature of absolute power.

In Act III, supernatural elements such as Banquo's ghost serve to heighten Macbeth's fear and guilt, underscoring the influence of the supernatural on the characters' actions and the plot.