The population exceeds 6.282 million. The Tibetan people mainly live in the Tibet Autonomous Region, Tibetan Autonomous Prefectures in Haibei, Huangnan, Hainan, Guoluo, Yushu and Haixi Mongolian Tibetan Autonomous Prefecture in Qinghai Province, Gannan Tibetan Autonomous Prefecture and Tianzhu Tibetan Autonomous County in Gansu Province, two autonomous prefectures of Ngawa and Garz and Muli Tibetan Autonomous County in Sichuan Province, and Diqing Tibetan Autonomous Prefecture of Yunnan Province. The people use the Tibetan language which belongs to the Tibetan branch of Tibeto-Burman languages of the Sino-Tibetan language family. There are three main dialects, namely Weizang, Kham and Amdo. The Tibetan script is a phonogram written horizontally from the left to the right created with reference to the Brahma script in the seventh century. The Tibetan people are mainly engaged in animal husbandry and agriculture with the focus on animal husbandry. They generally believe in Tibetan Buddhism. The Tibetan ethnic group has a long history and highly developed culture. The Tibetan people have made outstanding achievements in literature, music, dance, painting, sculpture, architectural art, etc. and have made great contributions to enrich the culture and art of the motherland. The Tibetans have their own calendar. The Tibetan calendar is a combination of the lunar and solar calendars. The year is divided into four seasons, in the order of winter, spring, summer and autumn, with 354 days in one year. There are many traditional Tibetan festivals. The Tibetan New Year is the most important festival for the Tibetan people. During the festival, people exchange "Hada", say "Zhasidler" to each other, perform Tibetan opera, do Xuanzi dance and hold activities such as wrestling, horse racing and archery. In addition, there are "Butter Lamp Festival", "Linka Festival", "Snowton Festival", "Wangguo Festival" and so on. Tibetan medicine is also considerably developed.