The Acceptable Quality Level (AQL) is a statistical measurement used in quality control to determine the maximum number of defective items considered acceptable in a sample batch. It helps manufacturers and inspectors decide whether to accept or reject a lot based on the number of defects found during inspection. AQL is often expressed as a percentage, indicating the proportion of defects allowed. AQL is commonly used in various industries, including manufacturing and pharmaceuticals, to ensure products meet quality standards. By setting an AQL, companies can balance the cost of inspection with the need for quality, ensuring that products are reliable while minimizing waste and expenses.