Gd'Day Mate!
In the crypto world, Binance is the biggest brand around and they offer an ecosystem of crypto services around their own cryptocurrency - the Binance coin (or BNB).
BNB powers the Binance Ecosystem and is the native coin of the Binance Chain and the Binance Smart Chain. BNB has several use cases:
Pay for trading fees on the Binance exchange;
Pay for trading fees on Binance DEX (Decentralized Exchange);
Pay for transaction fees on the Binance Chain;
Pay for transaction fees on the Binance Smart Chain;