Lido Finance is a protocol built on Ethereum that allows users to reap the benefits of ETH staking without the downsides. Normally, staking on Ethereum is very non-user friendly, as users must stake ETH in multiples of 32. Lido allows users to stake a much smaller amount of ETH, and gives them stETH tokens in return which represent their staked position. These stETH tokens can be put to work in other DeFi protocols to earn additional yield, such as providing liquidity or as collateral for a loan.