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Arbitrum is an Ethereum scaling solution that provides high throughput and low-cost smart contract execution.

Arbitrum is EVM-compatible. Developers can connect via Arbitrum's node API. The Arbitrum node is compatible with Ethereum's JSON-RPC API implementation, which allows using tools such as Infura, Hardhat, and MetaMask.

To use the Arbitrum blockchain, create a Web3 project and add the Arbitrum network add-on.

On off-chain protocols: sidechains and rollups

Read Infura blog for more information on off-chain protocols such as sidechains and rollups.

For more information on Arbitrum see Arbitrum's official documentation.