Six Sigma is a quality management methodology used to help businesses improve current processes, products or services by discovering and eliminating defects.

Six Sigma aims to increase the profits of the company or organization to increase the profits by getting rid of the variability, defects and the waste which will weaken the customer loyalty.

It uses a set of quality management methods, mainly empirical, statistical methods, and creates a special infrastructure of people within the organization who are experts in these methods. Each Six Sigma project carried out within an organization follows a defined sequence of steps and has specific value targets, for example: reduce process cycle time, reduce pollution, reduce costs, increase customer satisfaction, and increase profits.