The Van der Pol oscillator is a significant concept in dynamics that deals with non-conservative oscillators and non-linear damping. Originally developed by the Dutch engineer and physicist Balthasar van der Pol, this specialized book describes the mathematical foundations and applications of the oscillator, which is characterized by a specific differential equation. This equation illustrates how the position of a system changes over time and how the parameters of nonlinearity and damping influence the behavior of the system. The Van der Pol oscillator has found applications not only in electrical engineering, particularly in circuits with vacuum tubes, but also in various fields of natural sciences and mathematics. The book provides a solid introduction to the theory and practical aspects of this fascinating topic, making it a valuable resource for students and professionals.