What are the nature and status of moral norms? And what makes individuals abide by them? These are central questions in metaethics. The first concerns the nature of the moral domain—for example, whether it exists independently of what individuals or groups think of it. The second concerns the bindingness or practical clout of moral norms—how individuals feel impelled to abide by them. In this article, I bring two distinct approaches to these questions into dialogue with one another.