Hanja
Hanja is the Korean word for Chinese characters. It is about the Chinese characters that are borrowed from the Chinese language and used in the Korean language with Korean pronunciation. Hanja-mal or hanja-eo is about words which can be written with hanja. Hanmun (한문) is about the Chinese Classical writing, but hanja can sometimes be used to generally mean hanmun too. Hanja was never very changed, so almost all of the Chinese characters in hanja are the same as in traditional Chinese. Only a few hanja characters are unique to Korea.