Mongolian  language is language of the Altai family of languages. Today more than 10 million people who live in Mongolia, Kazakh, Buriat, Inner Mongolia, and others speak Mongolian language. The history of the Mongolian language is divided into three groups.

The Old Mongolian language lasted from ancient times till XII century. The documents of the period were inscribed into stone monuments called Tonyukuk.

The Middle Mongolian language period continued from XII-XVI century. During the time, the Secret history of Mongols, Arab-Mongolian dictionary and other important documents were composed. Also Mongolian language was divided into southern, eastern and western dialects. The Secret history of Mongols belongs to the eastern dialect, Arab-Mongolian dictionary to the western dialect.

The Mongolian modern language from 17th century until present days. During this period, the scientists said that standard Mongolian language was started. Mongolians have invented and used about 10 different scripts, such as dorvoljin, tod, soyombo letters and etc.

Mongol Script was adopted at the latest by decree of Genghis Khan in 1206 as recorded in The Secret History, and possibly earlier by some scholars' investigations.

 Old Mongolian script is known as Uighur Mongolian script. The old Mongolian script is written from top to bottom. The Uighur adopted their alphabet from the Sogdians in the 13th century. In 1944, the Russian Cyrillic alphabet was adopted, with two additional letters, replacing the old Mongolian scripts. Since that time all ordinary and official documents were written in Cyrillic. Therefore all Mongolian schools re-introduced into their training programs since 1990. Cyrillic has 35 letters and double vowels. Also one important thing is its pronunciation. Mongolian pronunciation is very difficult. Writer Tim Severin said that Mongolian language is like two cats coughing and spitting at each other.