Metaethics:Metaethics is the study of the nature of moral judgments, moral statements, and moral properties, as well as the meaning of moral language and the metaphysics of moral facts.
Deontology:Deontology is an ethical theory that judges the morality of an action based on the action's adherence to a rule or rules, rather than the consequences of the action.
Normative Ethics:Normative ethics is the study of ethical action, and is concerned with the criteria for what is considered morally right or wrong, good or bad.