Realism comes in different forms, and Kant's "Critique of Pure Reason" is the foundation of realism. Kant's ideas still influence modern debates on realism. He introduced the term 'realism' and outlined different types of realism. Kant's method helps distinguish between empirical (non-metaphysical) and transcendental (metaphysical) realism. This method is still useful in philosophy today, but it has its limits.