Also called Money Legos, refers to the idea of composability, the combining of simple protocols that are already doing something very well on their own, into a brand new protocol or service. Lego blocks, or individual protocols operating on the same blockchain network, can \"snap\" onto another Lego block, or protocol, creating new and incredible DeFi projects. The protocols can interoperate, or work together using middleware, that binds the various protocols together
Example
“A DeFi user leveraged money legos by depositing ETH into Aave to borrow USDC, then providing that USDC as liquidity on Curve, stacking yields across multiple protocols.”