Yearn.finance is a DeFi yield aggregator that runs on the Ethereum blockchain.
DeFi stands for decentralized finance. DeFi is a cryptocurrency movement designed to offer traditional financial products and services without the 'centralized' authority of a bank, government or business.
Yield aggregation refers to investing using the most current optimal strategy to maximize returns.
The optimal strategy is constantly changing.
Yearn is the easiest way for consumers to earn interest and maximize their returns on their cryptocurrency while also saving money on transaction fees and time spent researching.
In some ways this makes Yearn is similar to the roboadvisor products offered by Vanguard, Wealthfront and Betterment.