Ethics is the study of morality and human conduct. There are several branches of ethics including meta-ethics, normative ethics, applied ethics, descriptive ethics, and moral psychology. Meta-ethics examines the meaning of moral concepts. Normative ethics determines moral standards. Applied ethics applies moral principles to specific situations. Descriptive ethics studies people's actual moral beliefs. Moral psychology examines moral development and capacity. Principles of ethics include personal ethics concerning well-being and respect of others, global ethics of justice and environmental stewardship, and professional ethics of honesty, integrity, and accountability. Ethical principles serve as guidelines but may conflict in practice, requiring weighing of circumstances.