What characterizes Kant's noumenal world?

Kant's noumenal world is characterized by its nature as the realm of things as they are in themselves, independent of our perceptions or experiences. This contrasts with the phenomenal world, which consists of things as we perceive and conceptualize them. In the noumenal realm, objects exist independent of our sensory experience and interpretation, meaning it represents an objective reality that is not tainted by human perception or conceptual frameworks. This aligns with the idea that the noumenal world is an essential part of Kant's philosophy, where he differentiates between what we can know through our senses (phenomena) and what exists beyond our perception (noumena).