Holographic interferometry is the most important practical application of holography. It has a number of unique advantages that allow you to significantly expand the scope of its application. Meanwhile, there are no books on holographic interferometry in the literature. The proposed monograph contains both the theory and technique of holographic interferometry. The main emphasis is on experimental methods and practical applications. Separate chapters of the book are devoted to the study of deformations, vibrations and relief, plasma and shock waves.