Non-destructive testing (NDT) is a type of examination that doesn't need the component or system being tested to be changed or destroyed. Thanks to recent developments in sensing technology, data gathering, data storage, and signal processing, a variety of NDT methods are becoming more widely employed. Inspection data is commonly used to make informed maintenance decisions based on the flaws found, their location, and their severity. This book discusses the most current breakthroughs in several NDT techniques, as well as the primary ways used to analyse the signals collected during inspection.