ethics

The term ethics may refer to the philosophical study of the concepts of moral right and wrong and moral good and bad, to any philosophical theory of what is morally right and wrong or morally good and bad, and to any system or code of moral rules, principles, or values. The last may be associated with particular religions, cultures, professions, or virtually any other group that is at least partly characterized by its moral outlook.

Traditionally, ethics referred to the philosophical study of morality, the latter being a more or less systematic set of beliefs, usually held in common by a group, about how people should live. Ethics also referred to particular philosophical theories of morality. Later the term was applied to particular (and narrower) moral codes or value systems. Ethics and morality are now used almost interchangeably in many contexts, but the name of the philosophical study remains ethics.

Ethics matters because (1) it is part of how many groups define themselves and thus part of the identity of their individual members, (2) other-regarding values in most ethical systems both reflect and foster close human relationships and mutual respect and trust, and (3) it could be “rational” for a self-interested person to be moral, because his or her self-interest is arguably best served in the long run by reciprocating the moral behaviour of others.

No. Understood as equivalent to morality, ethics could be studied as a social-psychological or historical phenomenon, but in that case it would be an object of social-scientific study, not a social science in itself. Understood as the philosophical study of moral concepts, ethics is a branch of philosophy, not of social science.