Ethics (also known as moral philosophy) is a branch of philosophy which seeks to address questions about morality, such as what the fundamental semantic, ontological, and epistemic nature of ethics or morality is (meta-ethics), how moral values should be determined (normative ethics), how a moral outcome can be achieved in specific situations (applied ethics), how moral capacity or moral agency develops and what its nature is (moral psychology), and what moral values people actually abide by (descriptive ethics). Meta-ethics is concerned primarily with the meaning of ethical judgments and/or prescriptions and with the notion of which properties, if any, are responsible for the truth or validity thereof. Meta-ethics as a discipline gained attention with G.E. Moore's famous work Principia Ethica from 1903 in which Moore first addressed what he referred to as the naturalistic fallacy.

Moore's rebuttal of naturalistic ethics, his Open Question Argument sparked an interest within the analytic branch of western philosophy to concern oneself with second order questions about ethics; specifically the semantics, epistemology and ontology of ethics. The semantics of ethics divides naturally into descriptivism and non-descriptivism. Descriptivism holds that ethical language (including ethical commands and duties) is a subdivision of descriptive language and has meaning in virtue of the same kind of properties as descriptive propositions.

Non-descriptivism contends that ethical propositions are irreducible in the sense that their meaning cannot be explicated sufficiently in terms of descriptive truth-conditions. Correspondingly, the epistemology of ethics divides into cognitivism and non-cognitivism; a distinction that is often perceived as equivalent to that between descriptivists and non-descriptivists. Non-cognitivism may be understood as the claim that ethical claims reach beyond the scope of human cognition or as the (weaker) claim that ethics is concerned with action rather than with knowledge.

Cognitivism can then be seen as the claim that ethics is essentially concerned with judgments of the same kind as knowledge judgments; namely about matters of fact.

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