This short scene serves mainly to convey information to the audience. It indicates that a certain amount of time has passed. Lennox is a young man, but he is becoming worldly wise as a result of all he has seen and experienced since the night King Duncan was murdered. He shows that he has learned to be very circumspect in what he says because it is dangerous to talk openly. Macbeth has become a cruel tyrant. The conversation between the two characters shows that the important men of the realm are turning against Macbeth. We learn that Macduff is openly defiant. We learn that Malcolm, Duncan's son, is in England hoping to raise an army to attack Macbeth and that Macduff has gone there to join him. The scene mainly indicates the passage of time and conveys essential information to the audience.