This document provides an overview and introduction to the 10th anniversary edition of the World Happiness Report. It summarizes the key findings and developments in happiness research over the past decade. Specifically, it notes that interest in happiness and well-being as policy goals has grown substantially in recent years. However, global life evaluations have remained relatively stable on average, though there is variation between countries. The report also highlights several promising new areas of research that could further understanding of happiness, such as analyzing text to measure emotions and examining the biological factors associated with well-being.