BNB is the native cryptocurrency of the Binance ecosystem, initially launched in 2017 as an ERC-20 token on Ethereum. It later migrated to Binance Chain and Binance Smart Chain (BSC). BNB is used for trading fee discounts on Binance, transaction fees on BSC, staking, and participation in token sales. Binance conducts periodic BNB burns to reduce supply and increase scarcity. BNB has evolved beyond an exchange token into a key asset in DeFi, NFTs, and blockchain applications.