A quality management system (QMS) is a set of policies, processes, and procedures for planning and execution in core business areas. It aims to ensure quality of inputs, conversion processes, and outputs in a production system. Key aspects of a QMS include quality control of raw materials, production processes, and final products/services. Maintaining a successful QMS is important as it helps organizations produce high quality products and services through techniques like total quality management, just-in-time production, and computer-aided manufacturing. In conclusion, a QMS is a comprehensive effort to enhance an organization's product or service quality.