Hegel’s system, often called absolute idealism, sought to explain the development of history, art, and religion through the process of thesis, antithesis, and synthesis. His major works, like The Phenomenology of Spirit, argue that history is the unfolding of 'Geist' (Spirit or Mind). His influence on Western philosophy is immeasurable, providing the foundation for Marxism, existentialism, and modern political theory. His complex thought remains a primary subject of academic study and debate.