Which organization publishes the annual World Happiness Report that ranks countries based on their levels of happiness and well-being?

The annual World Happiness Report is published by the United Nations Development Programme (UNDP). This report ranks countries based on various factors related to happiness and well-being, including GDP per capita, social support, life expectancy, freedom to make life choices, generosity, and perceptions of corruption. The report aims to provide insights into the factors that contribute to overall happiness and to guide policymakers in their efforts to improve the well-being of their citizens.