The justification of morality is about presenting reasons for the recognition or rejection of moral norms and values. For more than a hundred years, philosophy has been concerned with the question of what it actually means to justify a moral judgment. The fundamental question is whether a moral judgment can have objective validity at all. Konrad Ott introduces the fundamental questions of moral justification and presents, among other things, Kant's ethics, the ethics of utilitarianism, contractualism, discourse ethics, and the approach of Alan Gewirth.