Legalism, also known as Fa Jia, is a philosophical school that emerged during the Warring States period in ancient China. It is based on the belief that strict laws and harsh punishments are necessary to maintain order and control in society. This school of thought places a strong emphasis on the role of the state and its laws in governing the people.

Legalism differs from other philosophical schools in several ways. Firstly, it rejects the idea of natural moral principles and instead focuses on the practical application of laws to regulate human behavior. This is in contrast to Confucianism, which emphasizes moral values and virtues as the basis for a harmonious society.

Secondly, Legalism places a strong emphasis on the power and authority of the state. It believes that the ruler should have absolute control over the people and that the laws should be strictly enforced to maintain order. This is in contrast to Taoism, which promotes the idea of ruling through non-action and natural harmony.

Another key difference is that Legalism does not believe in the inherent goodness of human nature. It sees human beings as inherently selfish and prone to corruption, and therefore, strict laws and punishments are necessary to keep them in line. This is in contrast to Mohism, which emphasizes the importance of universal love and benevolence.

Furthermore, Legalism also differs from other schools in its approach to education. While Confucianism promotes the importance of education and moral cultivation, Legalism sees education as a means to train individuals to follow the laws and serve the state. It prioritizes practical skills and knowledge over moral values and virtues.

In summary, Legalism is a philosophical school that emphasizes the importance of law and order in society. It differs from other schools in its rejection of natural moral principles, strong emphasis on the power of the state, belief in the inherent selfishness of human nature, and practical approach to education. Its influence can still be seen in modern-day China, particularly in the country's legal system and emphasis on strict laws and punishments.