This article presents results from the OECD’s Survey on Social and Emotional Skills (SSES) 2023. SSES is the largest international effort to collect data on these skills among 10- and 15-year-old students. The results show that students’ social and emotional skills – or 21st century skills – are linked to better life outcomes, including academic success, greater life satisfaction, healthier behaviours, less test and class anxiety, and more ambitious career plans. The Survey also finds that these skills are inequitably distributed among students by age, gender, and socio-economic background.