Korean is spoken by about 63 million people in South Korea, North Korea, China, Japan, Uzbekistan, Kazakhstan and Russia. The relationship between Korean and other languages is not known for sure, though some linguists believe it to be a member of the Altaic family of languages. Grammatically Korean is very similar to Japanese and about 70% of its vocabulary comes from Chinese.
Nor is there general agreement on the relationship of Korean to other languages. The most likely relationships proposed are to Japanese and to the languages of the Altaic group: Turkic, Mongolian, and especially Tungus (-Manchu-Jurchen).