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Arbitrum is an Ethereum scaling solution designed by Offchain Labs to reduce the costs and latency of decentralized applications (dApps) for users and developers. Using a variation of one of Ethereum’s popular scaling solutions, known as an “Optimistic rollup”, the Arbitrum Rollup protocol minimizes the amount of data used on-chain and supports arbitrary Ethereum Virtual Machine (EVM) smart contracts using common Ethereum tooling. Arbitrum smart contracts can be created using the Solidity programming language.