Vietnamese belongs to the South Asian language family-Vietnamese language family-Vietnamese branch. Vietnamese and Khmer are related.

Although Viet Nam once belonged to China for a long time, it was marked by Chinese characters for a long time in history, and it also incorporated Chinese vocabulary, but its language did not belong to Sino-Tibetan language family. Vietnam began to use Latin letters in 1945, which became phonetic symbols.

The main ethnic group in Vietnam is the Yue ethnic group (also called Jing ethnic group), but there are more than 50 other ethnic groups, including Zhuang, Khmer and China ethnic groups. They all have different languages, but Vietnamese used by the Yue ethnic group is the main language. The Jing people are also a minority in China, and the Jing people in China, Guangxi, Yunnan and Hainan also use Vietnamese.

South Asian languages are not widely distributed, only in South Asia. The northern part is Sino-Tibetan, the eastern and southern parts are Austronesian (the most widely distributed language family in the world), and the western part is Indo-European.

The representative languages of South Asian languages are Vietnamese, Khmer, Mongolian, Mongolian and Nicobar.