What was immanuel kant known for?

Immanuel Kant was known for his work in philosophy, particularly for his theories on ethics, epistemology, and metaphysics. His Critique of Pure Reason is one of his most famous works, in which he explores the nature of human knowledge and the limits of reason. Kant is also known for his categorical imperative, a moral principle based on the idea that one should act in a way that they would want everyone else to act in the same situation.