The Sino-Tibetan languages are a family of languages spoken in East and South Asia. They include Chinese, Tibetan, Burmese, and many other languages. The Sino-Tibetan language family is one of the largest language families in the world, with over 400 million speakers. It is believed that the Sino-Tibetan languages have a common ancestor, which is thought to have been spoken in the area of modern-day China.