ARBITRUM is an extension solution on Ethereum, using Optimistic Rollup technology to increase the throughput of Ethereum network and reduce transaction costs. It processs the transaction batch on Ethereum into a side chain, and then submits the results of these batch to the main chain of Ethereum, thereby achieving higher performance and lower costs. Here are some important information related to Arbitrum:Arbitrum One and Arbitrum Nova: Arbitrum One is the main application chain of Arbitrum, focusing on the DEFI protocol, etc. Arbitrum Nova focuses on meeting large -capacity applications that require lower costs, such as games and social applications.Arbitrum Nitro: Arbitrum Nitro is the underlying technology of Arbitrum products, supporting all Arbitrum chains. It is a solution based on Optimistic Rollup, which is used to optimize and batch transactions on Ethereum.Arbitrum Rollup: Arbitrum Rollup is one of the main cases of Nitro technology. It sorted and batch transactions on Ethereum to improve performance and reduce costs. It inherits the security of Ethereum.Arbitrum Anytrust: Arbitrum Anytrust is a variant of Arbitrum Nitro. By using weaker trust settings to achieve lower transaction costs and faster withdrawals. It relies on external data availability committees (DAC) to ensure data usability. Arbitrum Nova is built using Arbitrum Anytrust.Orbit: Orbit is a platform based on Arbitrum Nitro underlying technology. It allows starting a custom Layer 3 (L3) chain without permission. This provides developers with the ability to build their own chain on the Arbitrum ecosystem.In short, Arbitrum is a solution designed to improve Ethereum network performance and reduce transaction costs through Optimistic Rollup technology. It supports multiple application chains, where Arbitrum One and Arbitrum Nova are two important cases. These technologies are expected to bring better scalability and user experience to the Ethereum ecosystem.