The book is written on the course "Solid State Physics." It examines the basic physical properties of ferroelectrics and pays great attention to clarifying the general laws of the phenomenon. There are six chapters in the book. The first chapter is introductory and contains basic information on spontaneous polarization, pyroelectricity, ferroelectricity and antisegenetoelectricity. The second is devoted to the phenomenological theory of ferroelectricity. The third chapter deals with the domain structure. In the fourth, the basic physical properties of ferroelectrics are illuminated. The fifth chapter deals with the nature of spontaneous polarization and the sixth with anti-snow electricity. The book uses the International System of Units (SI), which allows you to apply a rational form of basic equations.