This document provides an overview of social finance, including definitions, examples of social finance instruments, and challenges. Social finance aims to use capital markets to generate both financial returns and positive social/environmental impacts. It includes debt, equity, and grants/donations used by non-profits, impact investors, foundations, and others. However, social finance faces challenges in areas like market development, confusing return expectations, and restrictive regulations/legislation. The document argues that continued development of this space will require strengthening both supply and demand, as well as modernizing rules and building capacity of organizations involved.