ISO 9001 is defined as the international standard that specifies requirements for a quality management system (QMS). Organizations use the standard to demonstrate the ability to consistently provide products and services that meet customer and regulatory requirements. It is the most popular standard in the ISO 9000 series and the only standard in the series to which organizations can certify.
ISO 9001 was first published in 1987 by the International Organization for Standardization (ISO), an international agency composed of the national standards bodies of more than 160 countries. The current version of ISO 9001 was released in September 2015.
ISO 9001 contains eight key principles of quality management which is not auditable but do form the fundamental characteristics of quality management:

1. Customer focus and customer satisfaction
2. Leadership
3. Involvement of people
4. Process approach
5. A systematic approach to management
6. Continual improvement
7. Factual approach to decision making
8. Mutually beneficial supplier relationship

Benefits of ISO 9001:2015 QUALITY MANAGEMENT SYSTEM:

• Provides national and international competitive,
• Increases economization, efficiency and profitability,
• Strengthens communication,
• Strengthens corporate image,
• Provides product/service reliability,
• Encourages customer-focused working,
• Increases employee motivation,
• Increases process efficiency by process approach,
• Establishes continual improvement of processes as corporate culture by corrective and preventative actions,
• Provides preventing economical and other losses due to quality problems,
• Decreases costs,
• Provides company acceptability by customer easily in export and internal market,
• Provides traceability and assessment easiness,
• Facilitates defining improvement areas,
• Could be carried out to companies of any size and from any sector.