Social insurance is a concept and field of study within social policy and economics focused on collective risk-pooling mechanisms designed to provide economic security against common life contingencies such as unemployment, old age, disability, and illness. It investigates systems typically funded through mandatory contributions and providing benefits based on eligibility criteria. Research in this area examines the design, administration, financing, and socio-economic impacts of these programs. Key characteristics analyzed include their mandatory nature, contribution-benefit structures, and public administration. Its significance lies in its function as a primary instrument of social protection, aiming to reduce poverty, smooth consumption, and enhance social stability by providing a safety net against predictable risks.