Six Sigma is a business methodology that focuses on improving processes by reducing defects through measurement and data-driven analysis. It uses a set of tools and techniques such as statistical analysis and the DMAIC process (Define, Measure, Analyze, Improve, Control) to help organizations transition from relying on intuition to using statistical analysis to improve quality, reduce costs, and increase customer satisfaction. Many organizations across industries have implemented Six Sigma as part of their quality management system to drive success.