What Is Blockchain Interoperability? Understanding the Technology Connecting Web3

Blockchain interoperability is the ability for separate blockchain networks to exchange data and value. Without it, each chain is an island: assets, apps, and users cannot move freely. An interoperability protocol provides the blockchain connectivity that turns isolated networks into a multichain ecosystem.

Cross-chain interoperability covers digital asset transfers and cross-chain messaging — moving tokens and communicating state between interoperable blockchains. That blockchain communication layer is what makes modern Web3 feel connected instead of fragmented.

Why the Multichain Ecosystem Needs Interoperability

Users hold funds across many blockchain networks. Developers ship apps on the chains that fit their product. Multichain infrastructure — bridges, messaging, and settlement rails — is how those worlds meet. Relay acts as production multichain infrastructure so digital asset transfers complete in seconds across 85+ chains.

When blockchain connectivity is slow or unreliable, users abandon flows. When an interoperability protocol is payments-grade, wallets and apps can treat the multichain ecosystem as one surface for onchain activity.