In a narrow sense, "kangaku" refers to traditional keigaku (study of Keisho in Confucianism) and the study of old documents during the period of Qin dynasty as opposed to Neo-Confucianism in the Song and Ming dynasties; in a broad sense, it is a general term for studies of knowledge imported from China, as opposed to Western learning and the study of Japanese classical culture.
漢学（かんがく）とは、狭義で言えば宋明理学に対する伝統的な経学及び清代の考証学の事を指し、広義では洋学・国学に対する中国伝来の学問の総称。