ISO 9001 is an international standard for quality management systems. It was first published in 1987 and has been revised several times since to keep up with changes in business and quality practices. The latest version, ISO 9001:2015, includes several changes from previous versions, including a new annex called Annex SL that establishes a common framework for all ISO management system standards. This high level structure includes elements like scope, leadership responsibilities, planning, support, operations, performance evaluation, and improvement. The standard emphasizes risk-based thinking, organizational context, leadership involvement, and flexibility over documentation requirements. It aims to help organizations better meet customer and regulatory requirements through an effective quality management approach.