Summer.fi is a platform that provides tools for users to interact with third-party DeFi protocols. It features the Lazy Summer Protocol, which offers automated, optimized yield strategies across various blockchain networks like Ethereum Mainnet, Arbitrum, and Base. The protocol utilizes AI-powered keepers to rebalance user funds into high-quality, risk-adjusted yield strategies, including those from partners like Hyperithm, Silo, Morpho, Origin Protocol, and Maple Finance. Summer.fi offers different risk-level vaults for assets like USDC and ETH, and features like cross-chain vaults and one-click vault switching to help users manage their DeFi investments efficiently. The platform also has a governance component, the Lazy Summer DAO, and a referral program called Beach Club.