Arbitrum is a platform designed to scale Ethereum by creating a Layer 2 solution that allows for faster and cheaper transactions while maintaining the security of the Ethereum network. Developed by Offchain Labs, it uses an off-chain protocol called Arbitrum Rollup to bundle or batch multiple transactions together off-chain, thus reducing the cost and complexity of operations.

Benefits of Arbitrum include improved scalability, high speed, and lower fees. Moreover, it has interoperability, integrating with various services in the Ethereum ecosystem, such as Uniswap, Chainlink, The Graph, and more.

To get started with Arbitrum, users need an Ethereum wallet that supports the network. Transactions made on Arbitrum will appear in the wallet like any other Ethereum transaction.