Explore the fundamental concepts of driven open quantum systems in this comprehensive lecture. Delve into the intricacies of describing and deriving equations for these systems, covering topics such as the Born approximation, two-level system dynamics, and quantum statistical mechanics. Learn about the basic physics of atoms and discover why a shift in perspective is necessary. Examine core developments in the field, including path integral methods and density matrix evolution. Gain valuable insights into the transition from microphysics to macrophysics in driven open quantum systems, presented by Sebastian DIEHL from the Institute for Theoretical Physics at the University of Cologne, Germany.