Deontology, particularly Kantian ethics, emphasizes acting according to universal moral principles that are binding on all rational beings, regardless of consequences or personal desires.

Utilitarianism, as proposed by Jeremy Bentham and John Stuart Mill, defines the morally right action as the one that produces the greatest happiness or well-being for the greatest number of people affected by the action.

Virtue ethics, as advocated by Aristotle and other philosophers, emphasizes the development of moral virtues, such as courage, honesty, and justice, as the foundation for ethical conduct.

In existentialism, authenticity involves living a life that is true to one's own values, beliefs, and unique experiences, rather than conforming to societal norms or external expectations.

Libertarianism, particularly in its ethical context, emphasizes the importance of individual freedom and autonomy in making moral decisions, without interference from external authorities or societal norms.

The categorical imperative in Kantian ethics is a moral principle that requires individuals to act according to maxims that they can consistently will to become universal laws, ensuring that their actions are morally right regardless of personal desires or consequences.

The veil of ignorance thought experiment in Rawlsian justice theory aims to eliminate bias and prejudice in decision-making by requiring individuals to make decisions as if they were unaware of their own personal characteristics, social status, or interests.

The golden rule is a moral principle that encourages individuals to treat others the way they would want to be treated, promoting reciprocity and empathy in ethical decision-making.

Care ethics, particularly as proposed by Carol Gilligan, emphasizes the importance of caring for and preventing harm to others, valuing relationships, and nurturing interdependence.

The trolley problem is a thought experiment that presents a scenario where an individual must choose between sacrificing one person to save many others, exploring the conflict between individual rights and the greater good.

The prisoner's dilemma is a game theory model that demonstrates the challenges of collective action, where individuals may act in their own self-interest even when it leads to a worse outcome for the group as a whole.

Libertarianism, particularly in its ethical context, emphasizes the importance of respecting and upholding individual rights and freedoms, including the right to property, liberty, and self-determination.

The paradox of hedonism suggests that the pursuit of pleasure as the sole goal of life can ironically lead to unhappiness, as it may result in overindulgence, dissatisfaction, and a lack of fulfillment.

Intuitionism, particularly as proposed by W.D. Ross, emphasizes the importance of acting in accordance with one's conscience or inner moral compass, rather than relying solely on rules or consequences.

The slippery slope argument is used to demonstrate how a seemingly small or insignificant action can lead to a series of increasingly problematic or unethical consequences, highlighting the potential for moral standards to erode over time.