Quality control is a process that ensures products or services meet certain standards of quality and reliability. This includes monitoring and testing products throughout the production process to identify any defects or deviations from specifications. Quality control aims to prevent defects, improve efficiency, and ensure customer satisfaction. Key aspects of quality control include inspection, testing, and documentation of results to ensure that products meet established criteria for performance, safety, and reliability. Various tools and techniques such as statistical process control, Six Sigma, and total quality management are commonly used in quality control processes.