 Definitions of morality in the normative sense—and, consequently, moral theories—differ in their accounts of rationality, and in their specifications of the conditions under which all rational persons would necessarily endorse the code of conduct that therefore would count as morality. These definitions and theories also differ in how they understand what it is to endorse a code in the relevant way. Related to these differences, definitions of “morality”—and moral theories—differ with regard to those to whom morality applies: that is, those whose behavior is subject to moral judgment. Some hold that morality applies only to those rational beings that have certain specific features of human beings: features that make it rational for them to endorse morality. These features might, for example, include fallibility and vulnerability. Other moral theories claim to put forward an account of morality that provides a guide to all rational beings, even if these beings do not have these human characteristics, e.g., God.