$BNB (Binance Coin) is the native cryptocurrency of the Binance ecosystem, one of the largest crypto exchanges globally. Initially launched as an ERC-20 token on Ethereum in 2017, it later migrated to Binance Chain. BNB is used for trading fee discounts, token sales, and various services within the Binance Smart Chain (BSC), a blockchain for DeFi apps and NFTs. Its utility and deflationary nature (via regular coin burns) help support its long-term value. BNB also enables staking, liquidity farming, and cross-chain operations, making it vital in the broader Binance ecosystem. It's widely held and traded in the crypto market.