In plain English
What Blockchain bridge means
If assets live on one chain but a user wants to use them on another, a bridge can move value or create a representation on the destination chain. The bridge may lock, burn, mint, or otherwise account for the asset depending on its design. That convenience comes with additional operational and security risk.
Why it matters
Bridges are central to multi-chain and layer 2 activity because they let users move assets between networks. But bridge design affects speed, fees, finality, and failure modes. In practice, users need to know what is being transferred, what is being trusted, and how to reverse the process if that is possible.
Example
A user sends ETH from Ethereum mainnet to an L2 bridge. The bridge may lock the ETH on mainnet and mint a representation on the L2, or it may use another accounting method. Later, the user can bridge back, subject to the bridge’s rules and settlement timing.
Quick answers
Common questions
Are bridges only for tokens?+
No. Some bridges also pass messages or arbitrary data, not just asset transfers.
Does a bridge remove custody risk?+
No. It changes the trust model. Some bridges are trust-minimized, but all bridges still introduce additional technical and operational risk.
Sources