Are investment banks and central banks traditional banks?

I study economics, and I haven't forgotten all these things, hehe.

1. China Construction Bank, China Industrial and Commercial Bank, China Agricultural Bank and China Bank are the four major state-owned commercial banks in China, along with Bank of Communications and XX Development Bank. The difference is that the shares of the four major state-owned commercial banks are all owned by the state, and other banks have some shares of other company groups, but all banks contain state-owned shares.

2. The four state-owned commercial banks are essentially the same. They are all in charge of China's financial system at the behest of the People's Bank of China, and the People's Bank of China is an important tool for China's currency regulation.