The Arbitrary Message Bridge (AMB) is designed to relay any data between two EVM-based chains. The originating contract encodes data in the form of an arbitrary method call, which can also include or exclude parameters. This information, along with the target contract address, is passed to the AMB contracts. As soon as data are relayed from chain A to chain B by the Arbitrary Message Bridge oracles, the bridge contract on side B passes the ABI-encoded method to the target contract.
AMB usage examples:
transfer NFTs between two chains
trigger a method in one chain after some contract invocation in another chain
propagate tokens prices to another chain
transfer digital asset (native or ERC20 tokens) ownership similar to the generic TokenBridge
synchronize contracts states between two chains
AMB's universality means it can be used as a base layer for bridge and application construction. Once the bridge contracts are deployed and the corresponding validators are running the oracles, other applications can use them without the need to deploy their own infrastructure.