This book introduces the simulation of discrete processes. Typical application examples include manufacturing processes, traffic situations, human flows, and business processes. The author conveys the fundamentals of event-driven simulation as well as its programming implementation. Through numerous examples, the solution of specific detail problems with fundamental character is demonstrated. The new challenges arising from the optimization of business processes concerning simulation form a focal point of the presentation, with a separate section dedicated to the theoretical foundations. The learning objective of the book is to develop the ability to model discrete processes with the appropriate tools and to design simulation software or to understand the mechanisms of existing simulation software so that they can be used profitably.