Major Wu dialects include those of Shanghai, Suzhou, Wuxi, Wenzhou, Ningbo, Hangzhou, Shaoxing, Jinhua, and Yongkang. Wu speakers, such as Chiang Kai-shek, Lu Xun, and Cai Yuanpei, occupied positions of great importance in modern Chinese culture and politics. Wu can also be found being used in Shaoxing opera, which is second only in national popularity to Peking opera; as well as in the performances of the popular entertainer and comedian Zhou Libo. Wu is also spoken in a large number of diaspora communities, with significant centers of immigration originating from Qingtian and Wenzhou. Suzhou has traditionally been the linguistic center of the Wu dialects and was likely the first place the distinct variety of Sinitic known as Wu developed. Suzhou Wu is widely considered to be the most linguistically representative of the family. It was mostly the basis of the Wu lingua franca that developed in Shanghai leading to the formation of modern Shanghainese, which as a center of economic power and possessing the largest population of Wu speakers, has attracted the most attention. Due to the influence of Shanghainese, Wu as a whole is incorrectly labelled in English as simply, "Shanghainese", when introducing the dialect family to non-specialists. Wu is the more accurate terminology for the greater grouping that the Shanghai dialect is part of; other less precise terms include "Jiangnan speech" (江南話), "Jiangzhe (Jiangsu–Zhejiang) speech" (江浙話), and less commonly "Wuyue speech" (吳越語). This dialect group (Southern Wu in particular) is well-known among linguists and sinologists as being one of the most internally diverse among the Sinitic language groups, with very little mutual intelligibility among varieties within the dialect clusters. Among speakers of other Sinitic languages, Wu is often subjectively judged to be soft, light, and flowing. There is an idiom in Mandarin that specifically describes these qualities of Wu speech: Ngu nung nioe niu (吴侬软语), which literally means "the tender speech of Wu". On the other hand, some Wu varieties like Wenzhounese have gained notoriety for their incomprehensibility to both Wu and non-Wu speakers alike, so much so that Wenzhounese was used during the Second World War to avoid Japanese interception. Wu dialects have the largest vowel quality inventories in the world. The Jinhui dialect spoken in Shanghai's Fengxian District has 20 vowel qualities, the most among all world languages. Wu dialects are typified linguistically as having preserved the voiced initials of Middle Chinese, having a majority of Middle Chinese tones undergo a register split, and preserving a checked tone typically terminating in a glottal stop, although some dialects maintain the tone without the stop and certain dialects of Southern Wu have undergone or are starting to undergo a process of devoicing. The historical relations which determine Wu classification primarily consist in two main factors: firstly, geography, both in terms of physical geography and distance south or away from Mandarin, that is, Wu dialects are part of a Wu–Min dialect continuum from southern Jiangsu to southern Hujian and Chaozhou. The second factor is the drawing of historical administrative boundaries, which, in addition to physical barriers, limit mobility and in the majority of cases more or less determine the boundary of a Wu dialect. Wu Chinese, along with Min, is also of great significance to historical linguists due to their retention of many ancient features. These two languages have proven pivotal in determining the phonetic history of the Sinitic languages. More pressing concerns of the present are those of language preservation. Many within and outside of China fear that the increased usage of Mandarin may eventually altogether supplant the languages that have no written form, legal protection, or official status and are officially barred from use in public discourse. However, many analysts believe that a stable state of diglossia will endure for at least several generations if not indefinitely.

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