What makes 粤菜, the cuisine of Guangdong Province, one of the Eight Great Cuisines of China?
The one word answer is diversity.
Guangdong has diversity of food ingredients and a melting pot of many different culinary traditions.
*Cantonese cuisine 广府菜 is the cuisine of the Pearl River Delta which includes the cities of Guangzhou, Hong Kong and Macau. Guangdong cuisine 粤菜 is the cuisine of Guangdong Province which includes Hakka cuisine and the cuisine of Chaoshan, etc.