A theme in Ayn Rand’s fiction is that the failure to understand evil is a source of error and unhappiness for good people. Drawing on the Objectivist corpus this talk will explore the nature of evil, including: the ways in which actions, motives, ideas and people can be evil; the respects in which evil is and is not important; and how understanding evil can help us to appreciate the good and to foster the best in ourselves and others. Recorded live as part of The Objectivist Conference on September 01, 2021.