Nondestructive testing or Non-destructive testing (NDT) is a wide group of analysis techniques used in science and industry to evaluate the properties of a material, component or system without causing damage. The terms Nondestructive examination (NDE), Nondestructive inspection (NDI), and Nondestructive evaluation (NDE) are also commonly used to describe this technology.

Because NDT does not permanently alter the article being inspected, it is a highly valuable technique that can save both money and time in product evaluation, troubleshooting, and research. Common NDT methods include ultrasonic,magnetic-particle, liquid penetrant, radiographic, remote visual inspection (RVI), eddy-current testing, and low coherence interferometry. NDT is commonly used in Foundry Unit, Forging Unit, , Pipeline, Automotive part Manufacturer , Fabricator, Steel Producer, Thermal Power Plant, Nuclear Power Plant, Hydro Power Plant, Oil Refinery, Petro Chemical Unit, Chemical Plant, Fertilizer Plant, Cement Manufacturer, Railways, Infrastructure & Construction, Port, Mechanical, Instrumentation, Commissioning, Onshore Offshore Oil & Gas Plant, Aerospace, General Industrial Companies.