A dialect or rather a language. Of course, Mandarin is the most popular one. But nonetheless, in Hong Kong, for instance, Cantonese is more popular, it's almost the one Chinese language there and ...
Can someone explain why Cantonese is considered as a dialect of Chinese, instead of a language? It is also for any language exist in China, both land and Taiwan (Cantonese, Hunanese, Fujianese, ...