Wormhole is a cross-chain messaging and bridging protocol that connects over 30 blockchains, enabling the transfer of assets and data between different networks. Originally built on Solana, Wormhole has expanded to support Ethereum, BNB Chain, Polygon, Avalanche, Arbitrum, Optimism, Sui, Aptos, and many other chains. The protocol uses a network of Guardian nodes that observe and validate cross-chain messages, with 19 validators securing the network. Wormhole supports various cross-chain use cases including token bridges, NFT transfers, cross-chain governance, and generalized message passing. It is one of the most widely adopted bridge protocols, securing billions in cross-chain transfers.