German Idealism emerged in the late 18th century, emphasizing the mind's role in shaping reality. Key thinkers like Kant, Fichte, Schelling, and Hegel developed complex theories about consciousness, knowledge, and the nature of existence. These philosophers explored concepts like the absolute, dialectical reasoning, and transcendental knowledge. Their ideas profoundly influenced later movements such as Marxism, existentialism, and phenomenology, shaping modern philosophical debates on mind, reality, and human progress.