Binance Coin (BNB) is Binance's native currency, the world's largest cryptocurrency exchange by volume of operations, as is the Binance Chain native cryptocurrency.
Its extensive functions in binance made the currency obtain great value in the market thus being in the top of cryptocurrencies in the market, given it serves as payment, since it is being accepted in multiple parts of the world.
By moving from the Ethereum Chain to its own chain as is the binance chain, giving it more firmness as the native currency of the Binance Exchange.