Inductive thermography is an excellent inspection technique for detecting defects in metallic materials. The technique has been greatly improved over the last few decades, from laboratory experiments to industrial applications. Many researches have studied the theory and the physical equations behind inductive thermography. The purpose of this paper is to give an overview of the theory and also of the most important technical points which should be taken into consideration for the usage of this technique. Examples are given of how it is used in industrial inspections today.