BNB is the native cryptocurrency of the BNB Chain ecosystem (formerly Binance Chain and Binance Smart Chain), a blockchain platform that supports smart contracts and decentralized applications. BNB Chain uses a Proof of Staked Authority (PoSA) consensus mechanism combining delegated proof-of-stake and proof-of-authority. BNB is used for transaction fees, staking, and participation in token launches, with a deflationary supply model through periodic token burns.