John Rawls, a pivotal 20th-century philosopher, revolutionized political thought with his "Theory of Justice." His work aimed to balance individual liberty and social equality, introducing concepts like the "original position" and "veil of ignorance" to determine fair principles of justice. Rawls proposed two key principles: the Liberty Principle, ensuring equal basic rights, and the Difference Principle, justifying inequalities only if they benefit the least advantaged. His ideas sparked debates on justice, equality, and political legitimacy, influencing policy discussions and constitutional design worldwide.