Chinese is spoken more than any other language in the world. Currently 20% of the global population - over one billion people - speak some dialect of Chinese as their native language. Mandarin speakers are greatly in demand in the corporate world and many high power executives count Mandarin proficiency among their skills set.
Much of the Chinese population is not English-proficient, making Mandarin skills a communication plus abroad.
Mandarin is also spoken in Malaysia, Taiwan, Indonesia, Singapore, Brunei, Mongolia and the Philippines.