There are four types of quality control: process control, acceptance sampling, control charts, and product quality control. 1. Process Control: It uses feedback to monitor and adjust processes to produce the desired results. 2. Acceptance Sampling: It is a quality control method in which a sample of products is inspected to determine if it meets the quality standards set by the company. 3. Control Charts: They are graphical tools used to monitor process stability and control. 4. Product Quality Control: It is the inspection of products to ensure that they meet the quality standards set by the company.