Optimism adopts a technology called Optimistic Rollup, which aggregates multiple transactions into side chains for execution and periodically synchronizes them to the main chain. Unlike traditional on-chain transactions, Optimistic Rollup assumes all transactions are valid, and validation only occurs when someone raises an objection. This operating mode reduces blockchain congestion and transaction costs while maintaining the security of the Ethereum main chain.

Optimism provides a developer-friendly environment that allows developers to directly use Solidity for smart contract development, and deploy on the Optimism Layer 2 network without modifying the original code. Additionally, users can interact with the Optimism ecosystem through common decentralized wallets such as MetaMask and WalletConnect.$OP