Answer:
In summary:The witches meet at the pit of Acheron and brew a spell in their cauldron to create trouble, likely for Macbeth. Hecate arrives and praises their efforts, and then Macbeth appears. During his visit with the witches, three apparitions rise from the cauldron, each one giving Macbeth information about his future. The first is a helmeted head that warns Macbeth to beware of Macduff. Macbeth gives thanks for the warning. The second is a bloodied child who assures Macbeth that "none of woman born shall harm Macbeth." At this, Macbeth decides Macduff isn't a threat, but he plans to kill him anyway, just to be safe. The third apparition is another child. This one wears a crown and holds a tree in its hand. It says Macbeth will hold the throne until Great Birnam Wood comes to Dunsinane Hill. Because the movement of an entire forest doesn't seem possible, Macbeth takes reassurance from this omen as well.
After the last apparition, Macbeth demands to know more, but the witches tell him to seek no more answers. He threatens them with a curse, and as the cauldron sinks into the earth, a procession of eight kings and Banquo's ghost enter the scene. Macbeth speaks to them, though they do not respond, and he understands from the ghost's smile that this vision is Banquo and his descendants, all kings. The final king holds a mirror, in which Banquo's line seems to stretch to infinity. Macbeth is upset, so the witches make music and dance to cheer him, and then they vanish.
Lennox arrives moments later with word that Macduff is in England. Macbeth decides to take this opportunity to ambush Macduff's castle at Fife. He plans to murder Macduff's family and servants, showing no mercy.
