LendingHand is a platform that uses machine learning models to help users invest in loans from Lending Club. The document discusses how LendingHand analyzes over 750,000 past loans and 80 features to build models that predict loan default risk and return. These models are then used to select loans that can achieve higher risk-adjusted returns compared to random selection. Key features like occupation and loan titles are found to impact default rates. Portfolio performance is backtested using the machine learning models to demonstrate their ability to outperform naive strategies.