The text discusses quantum physics, which is a branch of theoretical physics that studies quantum-mechanical and quantum-field systems and their laws of motion. It also describes quantum numbers, which are whole or fractional numbers that determine the possible values of physical quantities characterizing a quantum system (e.g. an atom or an atomic nucleus). It mentions the laws that govern quantum particles, such as their ability to exist in multiple places at once and appear from vacuum, and the applications of quantum physics in modern technologies. The text also introduces the uncertainty principle, a fundamental mathematical principle of quantum physics. It is covered in a textbook which contains theoretical and experimental material related to the main concepts of quantum physics and provides numerous examples and explanations.