Quality of life refers to the general well-being of individuals and societies, encompassing various factors that contribute to a fulfilling life. These factors include physical health, mental well-being, education, income, and access to essential services like healthcare and clean water. It also considers social relationships, safety, and environmental conditions. Measuring quality of life often involves surveys and indices that assess these different aspects. For example, the Human Development Index (HDI) combines indicators of life expectancy, education, and per capita income to provide a comprehensive view of a country's quality of life. Understanding these elements helps policymakers improve living conditions for their citizens.