$BNB " is the currency code for Binance Coin, which is the native digital currency of the Binance exchange, the largest cryptocurrency exchange in the world by trading volume. BNB was launched in 2017 as an ERC-20 token on the Ethereum blockchain, but later migrated to its own blockchain, Binance Chain.

BNB has various use cases, ranging from paying trading fees on the Binance exchange with significant discounts to being used as 'gas' to power transactions on BNB Smart Chain (BSC). BSC is a parallel blockchain that supports smart contracts and is EVM (Ethereum Virtual Machine) compatible, allowing developers to build decentralized applications (DApps) on it.

Additionally, BNB is used in initial exchange offerings (IEOs) on the Binance Launchpad platform, for booking hotels and flights, purchasing goods and services online, and even in gaming and entertainment. Binance periodically burns a portion of the total supply of BNB, reducing the circulating amount and aiming to increase its value over time. With its extensive ecosystem and multiple use cases, BNB is a strong digital currency that holds a prominent position in the crypto market.