Six Sigma was developed by Motorola in the 1980s to improve manufacturing processes and reduce defects. It uses a data-driven approach called DMAIC (Define, Measure, Analyze, Improve, Control) to reduce variation and improve quality. Companies that implement Six Sigma see significant financial benefits like cutting costs and increasing profits. It is popular across many industries and common certifications are Green Belt, Black Belt, and Master Black Belt which help individuals advance their careers.