A blockchain bridge is a protocol that enables the transfer of assets and data between different blockchain networks. Bridges solve the problem of blockchain interoperability, allowing users to move tokens across ecosystems.
Types of bridges include: Trusted bridges operated by centralized entities, Trustless bridges using smart contracts, Lock-and-mint bridges that lock assets on one chain and mint wrapped versions on another, and Liquidity bridges using pools on both chains.
Popular bridges include the Polygon Bridge, Arbitrum Bridge, Wormhole, and LayerZero. Each uses different mechanisms to enable cross-chain transfers.
Bridge security is critical as bridges have been targets for major hacks. Users should research bridge security, use established bridges, and consider the risks of cross-chain transactions.