$BNB (Binance Coin) is a cryptocurrency that was initially issued by Binance Exchange, one of the largest cryptocurrency exchanges in the world. BNB serves as the primary utility coin for the BNB Chain ecosystem (which consists of BNB Beacon Chain and BNB Smart Chain).

BNB was first launched in 2017 on the Ethereum blockchain as an ERC-20 token and then migrated to Binance's own mainnet. The initial total supply of BNB was 200 million coins, but it will continue to decrease due to the burning mechanism (reducing supply through periodic token burns).