Computer simulation is a key technology in contemporary research. In physics, it is used to model and understand physical processes. It is about the development and application of algorithms that allow solving physical problems that are not accessible by analytical calculations. The rapid development of high-performance computers makes it possible to make precise predictions about the physical behavior of complex systems. New algorithms include methods from the areas of artificial intelligence and machine learning. On the one hand, the aim is to contribute to the understanding of experimental discoveries. On the other hand, computer simulations can predict physical phenomena that are not yet accessible experimentally. Computer simulations are used in our department in the areas of solid state physics, modern materials and soft matter.