In most of the organizations Six-Sigma means a measure of quality that strives for the perfection.  It is disciplined, data-driven approach and methodology for eliminating defects or errors from the system by driving toward six standard deviations between the mean and the nearest specification limit in any process from manufacturing to transactional and from product to service. In any business process it mainly focuses on the quality improvement to generate quality outputs by removing the causes of errors and by minimizing the variability in the process. It uses a set of quality management methods to make the business system effective. The present provides historical overview of the Six Sigma development and improvement processes which includes the Belt system and methodologies to develop and implement the quality processes and by the way its impact on the business to deliver quality outputs. Further, paper is intended to conceptually make the student understand Six Sigma strategy and its importance in Project implementation.