BNB is basically an altcoin issued by the Binance exchange itself. We can also call it a trademark of binance. Let me give you an example, let's say you made a transaction on this stock exchange and if you have bnb, you pay 50% less commission. So you pay the commission 50% less for dollars than the bnb in your hand.
The coin, which was traded at $ 0.11 when it was first released, is now exactly $ 31. I don't know what will happen in the future, but my opinion is that this coin will always go up. Think about it, anyone who buys this coin and puts it aside will always pay less transaction fees.