The webinars in this section focus on electromagnetic testing (ET), an NDT method that uses a variety of techniques to detect surface and near-surface discontinuities within electrically conductive materials. The primary techniques that encompass the ET method are eddy current testing, alternating current field measurement, and remote field testing (RFT). The distinctive nature of each technique stems from differences in excitation frequencies, the nature of the transducers used, and the signal analysis techniques for characterizing the state of the test object. The primary purpose of ET is to detect discontinuities such as cracks, inclusions, gouges, and other surface and near-surface imperfections that could affect the serviceability of a part. However, ET is also useful in determining the state of a test specimen’s material properties including changes in conductivity and/or permeability and changes in the geometry of a part such as back-surface corrosion.