Nondestructive testing (NDT) is a type of testing that is used to evaluate the properties of a material, component, or system without causing damage.

This is in contrast to destructive testing, where the material is intentionally damaged in order to determine its properties. Nondestructive testing methods are used in a wide range of industries, including aerospace, manufacturing, construction, and oil and gas.

Some common nondestructive testing methods include visual inspection, ultrasonic testing, radiographic testing, and magnetic particle testing.

These methods use specialized equipment to detect flaws or irregularities in materials without damaging them. Nondestructive testing is an important tool for ensuring the safety and integrity of materials and structures.