Non-destructive testing (NDT) is a method of inspecting, testing, and evaluating materials, components, or systems without causing damage or alteration to the original item. This technique is used in various industries such as manufacturing, construction, aerospace, automotive, and infrastructure to ensure the quality, integrity, and safety of products. NDT methods include visual inspection, ultrasonic testing, radiography, magnetic particle testing, liquid penetrant testing, and eddy current testing, among others. These techniques can detect flaws, cracks, corrosion, and other defects in materials or structures, helping to prevent accidents, improve product reliability, and reduce maintenance costs. Overall, non-destructive testing plays a crucial role in ensuring the quality and safety of products and components in various industries, ultimately saving time and money by identifying defects before they lead to catastrophic failures.