What's the difference between quality control and IPQC?

IPQC is process QC, which we call production line inspection here. FQC is the final quality control, which is a pre-shipment sampling inspection. SQC is statistical QC, which means statistical quality control. Generally speaking, SPC uses data to control OQC, but this is shipment sampling. Although QC and QA are different in terms, I don't think there is much difference between quality control and quality assurance. It is only the function of quality management, and the specific work is divided into other items. The key point of control lies in the guarantee of production process, and the key point should be the guarantee of product delivery.