BNB, or Binance Coin, is a cryptocurrency that was created by the Binance cryptocurrency exchange. It was launched in July 2017 as an ERC-20 token on the Ethereum blockchain and later migrated to Binance Chain, which is Binance's native blockchain.

BNB serves multiple purposes within the Binance ecosystem. It can be used to pay for transaction fees on the Binance exchange, participate in token sales on the Binance Launchpad, and as a means of payment for various services and products within the Binance ecosystem.

One of the significant use cases of BNB is the Binance Launchpad, where BNB holders have the opportunity to invest in new cryptocurrency projects by purchasing tokens during their initial coin offerings (ICOs). BNB can also be used as a trading pair with other cryptocurrencies on the Binance exchange.

Binance has periodically conducted token burns, where a portion of the BNB supply is permanently removed from circulation. These token burns are intended to reduce the total supply of BNB and potentially increase its value over time.

In addition to its utility within the Binance ecosystem, BNB has gained wider adoption as a tradable cryptocurrency on various exchanges. It has experienced significant price appreciation since its launch, making it one of the top cryptocurrencies in terms of market capitalization.

It's important to note that cryptocurrency markets are highly volatile, and investing in cryptocurrencies carries risks. It's always recommended to do thorough research and consider personal financial circumstances before investing in any cryptocurrency, including BNB.