BNB, short for Build N' Build (formerly Binance Coin), is the native cryptocurrency of the BNB Chain ecosystem, which was developed by Binance, the world's largest cryptocurrency exchange by trading volume. Initially launched in 2017 as an ERC-20 token on the Ethereum blockchain, BNB later migrated to its own blockchain with the launch of Binance Chain.

BNB has evolved significantly from its initial purpose as a utility token for discounted trading fees on the Binance exchange. Today, it powers the entire BNB Chain ecosystem, encompassing the BNB Beacon Chain (governance) and the BNB Smart Chain (EVM-compatible for decentralized applications or dApps). It serves various use cases, including paying for transaction fees on the BNB Chain, interacting with dApps, participating in staking and governance, and even being used for payments in various real-world applications and services. Furthermore, BNB plays a crucial role in Binance's ecosystem, providing users with benefits like access to token airdrops, participation in Initial Coin Offerings (ICOs) via Binance's Launchpad, and VIP perks on the exchange. Binance also implements a quarterly "burn" mechanism, where a portion of the BNB supply is permanently removed, aiming to increase the scarcity and potentially the value of the remaining tokens. As of May 8, 2025, 1 BNB is equivalent to approximately 180,439.95 Sri Lankan Rupees.