Binance Coin (BNB)
The currency of the largest exchange of crypto is very simple, in fact it serves only to exchange other currencies.

The game was just that, through the BNB you can exchange other coins, but with BNB you can also group in a single time the small amounts of coins that remain after a trade, otherwise left there standing still, and even discounts on commissions of trade and withdrawals.
In short, since it was born it has been the most used currency of the exchange, in fact it is climbing the rankings because the volumes are very high.

They are objectively geniuses!