What is Six Sigma?

What is Six Sigma? How can it help me in my career? Does it make a large impact? Data and statistical analysis is used to find "problems" or "inefficiencies" within almost any business and with discipline can fix what needs improvement or is unwanted. It is an improvement methodology and management philosaphy. Six Sigma is used by many companies all over the world and is constantly improving the way these companies operate and are overall managed.