Balancer is a DeFi protocol that provides permissionless technology for automated market maker (AMM) development. It uses a unique Vault architecture to separate core design patterns into a singleton contract, enabling custom pool types like Weighted Pools, Boosted Pools, and LVR-mitigating stableswaps. Balancer serves as a focal source of fungible, yield-bearing, and MEV-mitigated liquidity across multiple chains.