Non-Destructive Testing (NDT), in contrast to mechanical testing, does not harm or change the substance being tested. NDT is a group of methods used to assess a material’s characteristics without doing any harm. These methods are especially helpful for assessing components that are pricey or difficult to replace. NDT techniques use various forms of energy, such as sound, light and radiation to evaluate the properties of a material. Some common NDT techniques include ultrasonic testing, radiography, eddy current testing and magnetic particle testing. These techniques are non-invasive and can be performed on a material while it is still in use, allowing for early detection of defects or damage. NDT is widely used in various industries, including aerospace, automotive and construction, to evaluate the quality and reliability of materials. It is also commonly used to inspect pipelines, bridges and other critical infrastructure to detect potential defects or damage that could lead to failure.