$BNB (Binance Coin) is the native cryptocurrency of Binance, one of the world's largest cryptocurrency exchanges. Launched in 2017, BNB is used for multiple purposes within the Binance ecosystem, including:

1. Trading fees: Users can use it to pay trading fees on the platform, which gives them discounts.

2. Transactions: It can be used in payment transactions and to facilitate purchases.

3. Investments: Used in some crowdfunding and ICOs on the Binance platform.

4. Programs: Allow users to access a range of services and features, such as participating in new offers.

BNB is one of the cryptocurrencies that has seen significant growth and is increasingly used in multiple fields.