Arbitrum is a layer 2 network scalability solution based on Optimistic Rollup for Ethereum, and Offchain Labs is the developer behind the Arbitrum ecosystem. the Arbitrum blockchain uses Rollup to reduce on-chain transaction costs and increase scalability by merging multiple transactions into one. This allows Arbitrum to achieve throughput of up to 40,000 transactions per second at a much lower cost of gas than the ethereum mainnet