Yearn Finance is a suite of DeFi products on the Ethereum blockchain that maximize yield by deploying capital to the most lucrative yield farming strategies. The protocol is governed by $YFI token holders.
Dharma currently integrates with Yearn Vaults, capital pools that automatically generate yield based on opportunities in the DeFi market. Vaults socialize gas costs (ie. Ethereum transaction fees), automating yield generation and capital deployment by shifting capital as new opportunities arise.
You can read more about Yearn here.