This is the most up-to-date, brief and accessible introduction to Kant's ethics available. It approaches the moral theory via the political philosophy, thus allowing the reader to appreciate why Kant argued that the legal structure for any civil society must have a moral basis. This approach also explains why Kant thought that our basic moral norms should serve as laws of conduct for everyone. The volume also includes a detailed commentary on Foundations of the Metaphysics of Morals, Kant's most widely studied work of moral philosophy.