Ethics
moral theory · moral philosophy
The systematic study of right action, good character, and the structure of moral claims.
In practice
A hiring manager discovers a strong candidate lied on one line of a résumé. Virtue ethics asks what tolerating it makes of the manager. Deontology asks whether honesty is a condition of the contract. Utilitarianism asks who is harmed by each option.
The common mistake
Treating the three families as personality types you pick once. Working philosophers use them as three instruments aimed at the same case, and the interesting result is when the readings disagree.
Ethics asks what a person ought to do, and why that answer binds them. Every other question in the field grows out of that one: what makes an action right, what makes a life good, and where the authority behind either claim comes from.
The three standard answers
Western moral philosophy has settled into three broad families, and almost every modern argument is a variant of one of them.
- Virtue ethics asks what kind of person you are becoming. Aristotle argued in the Nicomachean Ethics (c. 340 BC) that the good life is activity of the soul in accordance with excellence, and that excellence is built by habit rather than chosen in a moment.
- Deontology asks what duty requires. For Kant, an action has moral worth when it is done from duty, and the test of a duty is whether you could will everyone to act on it.
- Utilitarianism asks what the consequences are. John Stuart Mill held that actions are right in proportion as they tend to promote happiness.
These disagree about where moral weight sits: in the agent, in the act, or in the outcome. Most real disputes about a hard case turn out to be disputes about which of those three to look at first.
Meta-ethics and normative ethics
Normative ethics asks which actions are right. Meta-ethics asks what moral claims are doing in the first place — whether "cruelty is wrong" states a fact, expresses an attitude, or reports a convention. Hume sharpened this in the Treatise of Human Nature (1739) by noticing that writers slide from statements about what is to statements about what ought to be without explaining the move. That observation became the is-ought gap.
A third branch, applied ethics, takes the machinery to particular questions: medicine, war, business, animals. It is where the abstract families meet cases that will not sit still.
Why the disagreement persists
The three families rarely disagree about ordinary cases. They diverge at the edges — when keeping a promise causes harm, or when a small injustice buys a large benefit. Philosophers use those edge cases deliberately, because a theory shows its shape where it is under strain.
Concept web
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What is ethics in philosophy?
Ethics is the study of what a person ought to do and what makes a life good. It covers normative theories of right action, meta-ethical questions about what moral claims mean, and applied questions in fields such as medicine and business.
What are the three main ethical theories?
Virtue ethics judges character and asks what kind of person an action makes you. Deontology judges the act itself against duties or rules. Utilitarianism judges consequences, counting an action right if it produces more good than the alternatives.
What is the difference between ethics and morality?
In ordinary use the words overlap. Philosophers often treat morality as the set of norms a person or culture actually holds, and ethics as the reasoned study of whether those norms can be justified.