This chapter of the book on numerical physics focuses on the use of particle methods for simulating plasmas and plasma-like media. It covers the entire process of a computer experiment, from the physical phenomenon to the computer testing of programs. The methods are illustrated through examples in plasma physics, astrophysics, semiconductor physics, and solid-state physics. The book is structured into 12 chapters, each addressing specific aspects of particle simulations, including one-dimensional plasma models, time integration schemes, particle-mesh force calculations, collisionless particle models, and applications in plasma, semiconductor, astrophysical, and solid-state physics.This chapter of the book on numerical physics focuses on the use of particle methods for simulating plasmas and plasma-like media. It covers the entire process of a computer experiment, from the physical phenomenon to the computer testing of programs. The methods are illustrated through examples in plasma physics, astrophysics, semiconductor physics, and solid-state physics. The book is structured into 12 chapters, each addressing specific aspects of particle simulations, including one-dimensional plasma models, time integration schemes, particle-mesh force calculations, collisionless particle models, and applications in plasma, semiconductor, astrophysical, and solid-state physics.