Optimism adopts a technology called Optimistic Rollup, which aggregates multiple transactions on the side chain 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 files a dispute. 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 like MetaMask and WalletConnect.$OP