The short answer
A token bridge connects representations of an asset across networks. Depending on the design, the source asset can be locked, burned, transferred into liquidity, or otherwise accounted for while a destination representation becomes available.
How it works
The user experience can look like a single transfer even when the infrastructure performs several operations. The route determines which contracts, liquidity sources and transactions are involved.
Why it matters
Compatibility is essential. The token, source network and destination network must all be supported, and the destination application must recognize the resulting asset.
Practical takeaway
Use live route information and verify the destination contract or token representation when required. A bridge is not a guarantee that every token can move to every chain.