QC is the abbreviation of English QUALITY CONTROL, which means quality control in Chinese.
The main difference between QC and QA is that the former is to ensure that the product quality meets the requirements, and the latter is to establish a system to ensure that the system runs as required, thus providing internal and external trust. At the same time, QC and QA have the same points: QC and QA need to verify whether the products meet the specified requirements, such as QC testing the products according to the standards, QA conducting internal audit to verify whether the system operates according to the standards, and QA conducting shipment audit and reliability test, such as verifying whether the products have carried out various activities according to the regulations and whether they can meet the specified requirements to ensure delivery.