What is mining fee

In the digital currency system, each transfer information will be recorded in the "ledger" including the wallet address, amount, time, etc. of the transfer out/in;

This "ledger" is a blockchain record, which is 100% open, transparent and unique; the person who records each transaction on the "ledger" is the "miner"; in order to attract miners to keep accounts and speed up transaction confirmation, you need to pay a certain amount of mining fees to the miners when transferring money.