Lean Six Sigma is a process improvement methodology that combines the principles of Lean, which focuses on reducing waste and increasing efficiency, with Six Sigma, which aims to improve quality by minimizing variability and defects. It uses a data-driven approach through the DMAIC (Define, Measure, Analyze, Improve, Control) process to identify inefficiencies and implement solutions. Lean Six Sigma helps organizations enhance performance, reduce costs, and improve customer satisfaction by streamlining operations and ensuring consistent quality. It is widely used across industries for continuous improvement and operational excellence.