This document discusses inspection, which is defined as measuring, examining, testing, or comparing a unit to requirements to ensure quality. There are various types of inspection like operator inspection, in-process inspection, tollgate inspection, and automated inspection. The type of inspection used depends on factors like the process, cost-effectiveness, and defect rate. Inspection tools include acceptance sampling, where a percentage of a lot is examined to reject the whole lot, and control charts which take samples to measure characteristics and ensure quality standards are met. Inspection is a critical part of manufacturing to prevent expensive costs from issues down the line.