With the final date for Ethereum’s Shanghai Upgrade set for April 12, 2023, the transaction speed on the Ethereum network will once again be increased, transaction fees will be reduced, and staking with a flexible unlocking method after the upgrade will bring long-term benefits to stakers. Layer 2, as a scaling solution for Ethereum, may once again come into the spotlight with the upgrade, along with various opportunities emerging in the Layer 2 sector. As the leading project of the Layer 2 optimistic rollup solution, Arbitrum airdropped its governance token ARB on March 23, 2023, signaling a massive leap towards greater decentralization. Let's explore how Arbitrum uses rollups to make waves in Layer 2.