Arbitrum is a Layer 2 scaling solution for the Ethereum blockchain designed to make transactions faster and more cost-effective. It achieves this by processing transactions off the main Ethereum network and then recording the results back on it, reducing congestion and lowering fees. Arbitrum’s flagship product, Arbitrum Rollup, is an Optimistic Rollup protocol that inherits Ethereum-level security, allowing users to perform the same activities as on Ethereum—such as using Web3 applications and deploying smart contracts—but with improved efficiency.