A cross-chain bridge is a protocol that moves tokens or messages from one blockchain to another. It usually locks an asset on the source chain and issues a matching representation on the destination.
Finality is the point at which a blockchain transaction can no longer be reversed or reordered. Networks reach it through different mechanisms and at very different speeds.
A Layer 2 is a network built on top of a base blockchain that processes transactions away from the main chain and settles the results back to it. The aim is lower fees and higher throughput.
A multisig is a crypto wallet that needs approval from several keys before a transaction can go through, such as any three of five signers. It removes the single point of failure of one private key.
Blockchain interoperability is the ability of separate blockchains to exchange data, assets and messages so applications can work across them. It relies on bridges, messaging protocols and shared standards.
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