some example of Quality assurance and Quality control?

Quality control = inspection
Quality assurance is what supports Quality control to make it effective - trained inspectors, who use (controlled) inspection instructions to describe the inspections, using calibrated equipment and so on. QC is often internally defined by an organization for internal purposes ("we should check that to make sure"), QA is often defined by a customer on an organization so they have confidence the product they receive is going to be good. ("we want you to check the product using x, y and z")