Discrete-event modeling and simulation is a process that mimics the operation of a real-world system over time. It represents the system as a discrete sequence of events in time and models how the system changes state at each event. This technique allows analysts to easily evaluate and optimize complex systems that are difficult to study through analytical or physical experimentation alone.

1. Discrete-Event Modeling and Simulation:
A Practitioner´s Approach. Section 1, Chapter 1
Gabriel A Wainer