This book invites philosophers and their students to consider two of the most fundamental questions in moral and political philosophy: Why be moral? And, what does morality require? Distinguished philosopher James P. Sterba presents his unique views on these topics. Sterba first argues from rationality to morality and then from morality to substantial equality. Prominent scholars Charles W. Mills, Candace A. Vogler, Anita Superson, Russ Shafer-Landau, Allan F. Gibbard, Gerald Gaus, and Tibor Machan provide thought-provoking critical responses. In the final part, Sterba addresses these critiques, inviting readers to explore the various arguments and reach their own conclusions on these fundamental questions of moral and political philosophy. Morality: The Why and What of It is an essential text for all students and scholars of ethics and political philosophy.