Ceylon cinnamon powder is made from grinding C4 Ceylon cinnamon. You will taste the difference between Kurundu Ceylon cinnamon powder and other cinnamon powders -- a lot of other ground cinnamon is made from grinding Ceylon cinnamon chips or quillings unless otherwise specified.
Ceylon cinnamon is native to Sri Lanka (previously Ceylon) and Sri Lanka produces the largest quantity and best quality Ceylon cinnamon. Ceylon cinnamon has a very delicate taste compared to cassia (AKA North American Cinnamon). Ceylon cinnamon uses only the inner bark from the Ceylon tree, has a fine texture and is considered to be milder than cassia. There are many grades of Ceylon cinnamon; Alba, Special, Continental (C00000, C0000, C000, C00 and C0), Mexican (M0000 special, M0000, and M000) and Hamburg (H1, H2 and H3).