Aristotle, a student of Plato and teacher of Alexander the Great, was a Greek philosopher who significantly influenced Western political thought. His work "Politics" explored citizenship, regime types, and the ideal political system, emphasizing empirical observation and rational analysis. Aristotle viewed humans as political animals naturally forming communities. He defined citizenship as active participation in political life, excluding certain groups. His concept of the best regime balanced social classes, promoted the common good, and emphasized education in cultivating virtuous citizens.