This volume introduces a wide range of important views, questions, and controversies in and about contemporary metaethics. It is natural to ask: What, if anything, connects this extraordinary range of discussions? This introductory chapter aims to answer this question by giving an account of metaethics that shows it to be a unified theoretical activity. According to this account, metaethics is a theoretical activity characterized by an explanatory goal. This goal is to explain how actual ethical thought and talk—and what (if anything) that thought and talk is distinctively about—fits into reality.