Non-Destructive Testing:
(Non-destructive testing), NDT is a type of inspection performed without damaging the integrity of the material or part to be examined. Non-destructive testing methods are used to detect invisible discontinuities in materials or open discontinuities on the material surface

Destructive Testing:
It is an inspection method applied to determine the resistance and strength of materials against permanent deformations such as Tensile, Compression, Bending, etc.