Chinese is the most widely spoken language in the world. The language is actually made of of made dialects, some of which include the better known Shanghainese, Fujianese and Cantonese, the latter two also spoken in Hong Kong and amongst the Overseas Chinese. There is also Mandarin Chinese which is promoted as the official Chinese language.
Also to be taken into consideration is Chinese scripts, local dialects and pronunciation. And did we mention that there are over 56,000 Chinese characters!