Optimism is a "Layer 2" scaling solution for Ethereum. It bundles many transactions off the main Ethereum chain (Layer 1) into a single, cheaper one. This "Optimistic Rollup" approach significantly reduces transaction fees and increases speed, making dApps and DeFi more accessible.

Its future is strong because it inherits Ethereum's security while solving its congestion problems. Optimism's modular design (OP Stack) also allows other chains to easily build on its technology, fostering a connected "Superchain" ecosystem, which is crucial for Web3's growth and mass adoption.