This document summarizes key facts and challenges facing girls and young women globally. It notes that approximately half of the 1.8 billion young people in the world, or 900 million, are adolescent girls and young women. However, many face discrimination and health risks, with only 50% completing primary school in poor countries. They have higher rates of child marriage, HIV infection, and sex trafficking. Investing in girls' education and empowerment would boost social and economic development while respecting human rights.