Binance coin is a utility token born from the Binance chain. Its first objective is to serve as a means of exchange within the exchange platform. It provides huge advantages within the platform such as reductions on exchange fees, allows to participate in IEO, etc. To give more value to its tokens, binance burns a certain amount of BNB each quarter until it has burned at most 50% of its total amount in circulation.
Recall that the BNB has weathered the crises and resisted the downturns experienced by most cryptocurrencies. This thanks to the real utility and not only the speculative aspect of his token.