What is Minnan dialect? What is the national language?

Minnan dialect originated from a language in southern Fujian, and in a narrow sense, it includes Xiamen, Quanzhou, Zhangzhou and most parts of Taiwan Province Province. But in a broad sense, it also includes China, Wenzhou, Zhejiang, Chaoshan, Guangdong, a small part of Jiangxi, and some places in Hainan. People who speak Minnan dialect are also distributed overseas in Singapore, Malaysia, the Philippines, Brunei and Indonesia. They came from early Fujian immigrants, and some Chinese who speak Minnan dialect are also distributed in the United States and Canada. It is the three main dialects in China. The number of people who use Minnan language in the world ranks 22nd.

And Mandarin is Mandarin, which is also called Mandarin abroad. Everyone is familiar with this, so I won't explain it here. I hope I can help you.