second largest language family by number of speakers: ~1.3 billion
branches: Sinitic (Mandarin, Cantonese, Wu, Min, Hakka) and Tibeto-Burman (Tibetan, Burmese, Bodo, Tamang)
Mandarin Chinese: most spoken language on Earth (~920 million native speakers)
tonal languages: pitch distinguishes meaning (Mandarin has 4 tones, Cantonese has 6-9)
Chinese writing system is logographic: hanzi characters represent morphemes, shared across mutually unintelligible spoken varieties
literary tradition spanning 3,400+ years from oracle bone inscriptions through classical Chinese
Chinese characters influenced Japanese kanji, Korean hanja, Vietnamese chu Nom
the Sinitic branch preserves one of the longest continuous writing (invention) traditions in human history