The defect rate is a measure used to quantify the number of defective items produced in a manufacturing process. It is typically expressed as a percentage, calculated by dividing the number of defective products by the total number of products produced, then multiplying by 100. A lower defect rate indicates a higher quality of production, while a higher defect rate suggests potential issues in the manufacturing process. Monitoring the defect rate is crucial for companies, as it helps identify areas for improvement and maintain product quality. By analyzing the defect rate, businesses can implement quality control measures and enhance their production processes, ultimately leading to increased customer satisfaction and reduced costs associated with returns and repairs.