The official language is Mongolian, and is spoken by 95% of the population.
The traditional Mongolian script was adapted from Uyghur script probably at the very beginning of the 13th century
Between 1930 and 1932 the Mongolian Cyrillic script was declared mandatory by government decree
Uyghurjin Mongol bichig (cyrillic), was the first writing system created specifically for the Mongolian language, and was the most successful until the introduction of Cyrillic in 1946
Via Renee Simons, Midgaa Midga