Quality assurance is a way of preventing mistakes and defects in manufactured products and avoiding problems when delivering solutions or services to customers, it is part of a total quality management (TQM) principal focused on providing documented confidence that quality requirements will be and have been fulfilled from seed to sale.
Quality control is the part of quality management focus that deals with the results of deploying and fulfilling of the quality assurance process.
The fulfilled quality control documents support the seed to sale quality requirements of the TQM principle ensuring a safe product.
Quality assurance consists of part of a quality management focus process, specifically the part on providing documented confidence that quality requirements will be fulfilled.
Quality Control consists of part of the quality management focus that verifies and documents the results and fulfills the quality assurance process.
It is an integral part of a system operations plan (SOP) that contains the planned and systematic activities of every process implemented within a seed to sale transaction.
Quality has been defined as an indication of fitness for use, a demonstration of conformance to requirements, but mostly the pursuit of excellence in product or service. Quality is the difference in a competitive market.