Optimism is a Layer 2 scaling solution for Ethereum that uses optimistic rollups to increase transaction speed and reduce costs. By processing transactions off-chain and submitting them in batches, Optimism helps Ethereum scale while maintaining security and decentralization.

It enables faster and cheaper decentralized applications (dApps) and smart contracts, offering developers a familiar environment. Optimism plays a crucial role in Ethereum's long-term scalability, making blockchain technology more accessible and efficient for users worldwide.