The ISO 9000 family of standards is related to quality management systems and designed to help organizations ensure that they meet the needs of customers and other stakeholders while meeting statutory and regulatory requirements related to the product. The standards are published by ISO, the International Organization for Standardization, and are available through national standards bodies. ISO 9000 deals with the fundamentals of quality management systems, including the eight management principles on which the family of standards is based. ISO 9001 deals with the requirements that organizations wishing to meet the standard have to fulfill.
Third party certification bodies provide independent confirmation that organizations meet the requirements of ISO 9001. More than one million organizations worldwide are independently certified, making ISO 9001 one of the most widely used management tools in the world today. Source Wikipedia.