The 3 apparitions in "Macbeth" that appear to Macbeth provide important insights into the future and his own character. The first apparition is a floating head, which warns Macbeth to beware of Macduff, saying "Macbeth! Macbeth! Macbeth! Beware Macduff; / Beware the thane of Fife" (Act IV, Scene 1). The second apparition is a bloody child who tells Macbeth that "none of woman born / Shall harm Macbeth" (Act IV, Scene 1). The third apparition in "Macbeth" is a child wearing a crown and holding a tree, who says that Macbeth cannot be defeated until Birnam Wood moves to Dunsinane, saying "Macbeth shall never vanquished be until / Great Birnam Wood to high Dunsinane Hill / Shall come against him" (Act IV, Scene 1).
These apparitions are significant because they not only foreshadow Macbeth's downfall but also reveal his character flaws. The apparitions appeal to Macbeth's ambition and desire for power, leading him to believe that he is invincible and cannot be defeated. Macbeth's tragic flaw is his unchecked ambition, and these apparitions only serve to further corrupt him. The apparitions also show the destructive nature of Macbeth's actions, as they bring about his downfall and the ruin of Scotland.
Overall, the apparitions in "Macbeth" provide crucial insight into the future and reveal the character flaws of Macbeth. They show how unchecked ambition can lead to corruption and destruction. Shakespeare uses these apparitions as a tool to foreshadow events to come and to illustrate the tragic consequences of Macbeth's actions.