Mandarin is by far the largest of the seven or ten Chinese dialect groups, spoken by 70 percent of all Chinese speakers over a large geographical area, stretching from Yunnan in the southwest to Xinjiang in the northwest and Heilongjiang in the northeast. This is generally attributed to the greater ease of travel and communication in the North China Plain compared to the more mountainous south, combined with the relatively recent spread of Mandarin to frontier areas.
Most Mandarin varieties have four tones. The final stops of Middle Chinese have disappeared in most of these varieties, but some have merged them as a final glottal stop. Many Mandarin varieties, including the Beijing dialect, retain retroflex initial consonants, which have been lost in southern dialect groups.
The capital has been within the Mandarin area for most of the last millennium, making these dialects very influential. Some form of Mandarin has served as a national lingua franca since the 14th century. In the early 20th century, a standard form based on the Beijing dialect, with elements from other Mandarin dialects, was adopted as the national language. Standard Chinese is the official language of the People's Republic of China and Taiwan and one of the four official languages of Singapore. It is used as one of the working languages of the United Nations. It is also one of the most frequently used varieties of Chinese among Chinese diaspora communities internationally.
The English word "mandarin" (from Portuguese mandarim, from Malay menteri, from Sanskrit mantrin, meaning "minister or counsellor") originally meant an official of the Ming and Qing empires. Since their native varieties were often mutually unintelligible, these officials communicated using a Koiné language based on various northern varieties. When Jesuit missionaries learned this standard language in the 16th century, they called it "Mandarin", from its Chinese name Guānhuà (官话/官話), or "language of the officials".
In everyday English, "Mandarin" refers to Standard Chinese, which is often called simply "Chinese". Standard Chinese is based on the particular Mandarin dialect spoken in Beijing, with some lexical and syntactic influence from other Mandarin dialects. It is the official spoken language of the People's Republic of China (PRC), the de facto official language of the Republic of China (ROC, Taiwan), and one of the four official languages of the Republic of Singapore. It also functions as the language of instruction in Mainland China and in Taiwan. It is one of the six official languages of the United Nations, under the name "Chinese". Chinese speakers refer to the modern standard language as