Cantonese is a language within the Chinese (Sinitic) branch of the Sino-Tibetan languages originating from the city of Guangzhou and its surrounding Pearl River Delta. It is the traditional prestige variety of the Yue Chinese group, which has over 82.4 million native speakers. While the term Cantonese specifically refers to the prestige variety, it is often used to refer to the entire Yue subgroup of Chinese, including related but partially mutually intelligible varieties like Taishanese.

The Pearl River Delta Metropolitan Region is the low-lying area surrounding the Pearl River estuary, where the Pearl River flows into the South China Sea. Referred to as the Guangdong–Hong Kong–Macao Greater Bay Area in official documents, the region is one of the most densely populated and urbanized regions in the world, and is considered a megacity by numerous scholars. It is currently the wealthiest region in Southern China and one of the wealthiest regions in China along with the Yangtze River Delta in Eastern China and Jingjinji in Northern China. Most of the region is part of the Pearl River Delta Economic Zone, which is a special economic zone of China.