Quality control (QC) is a process used to ensure that products or services meet specified requirements and standards of quality. QC is an important part of the manufacturing and service delivery process, as it helps to identify and correct defects and inconsistencies, and to ensure that the final product or service meets the requirements of the customer or the end user.

QC typically involves a combination of inspection, testing, and verification activities, which are performed at different stages of the production or delivery process. These activities may be performed by trained and certified personnel, using specialized equipment and techniques, and may be governed by specific QC standards and procedures. The results of the QC activities are typically documented and used to identify and address any problems or nonconformities, and to improve the quality of the products or services.

QC is an important part of quality management, and is typically integrated with other quality management processes, such as quality planning, quality assurance, and quality improvement. By ensuring that products and services meet specified requirements and standards of quality, QC can help to improve customer satisfaction, reduce waste and rework, and improve the overall performance and competitiveness of the organization.