Ultrasonic Testing (UT) is an advanced Non-Destructive Testing (NDT) method used to detect internal defects, discontinuities, and material thickness variations in industrial components without causing any damage to the material. This technique uses high-frequency ultrasonic sound waves to evaluate the internal condition of materials with exceptional accuracy and reliability. In addition to conventional Ultrasonic Testing (UT), advanced techniques such as Ultrasonic Thickness Gauging (UTG), Phased Array Ultrasonic Testing (PAUT), and Time of Flight Diffraction (TOFD) provide enhanced inspection capabilities for defect detection, weld evaluation, corrosion monitoring, and thickness measurement.