Here's why:
* Number of Speakers: Mandarin is the native language of over 900 million people worldwide, making it the most spoken language on Earth.
* Official Language: It's the official language of mainland China, Taiwan, and Singapore.
* Education and Media: Mandarin is the primary language of education and media in China, contributing to its widespread use.
While other Chinese varieties like Cantonese, Wu, Min, Hakka, and others have significant numbers of speakers, Mandarin's dominance is undeniable due to its official status, widespread use, and large number of speakers.