wht is discrete event simulation?

Answer 1

Discrete-event simulation is used to simulate components which normally operate at a higher level of abstraction than components simulated by continuous simulators. Within the context of discrete-event simulation, an event is defined as an incident which causes the system to change its state in some way. For example, a new event is created whenever a simulation component generates output. A succession of these events provide an effective dynamic model of the system being simulated. What separates discrete-event simulation from continuous simulation is the fact that the events in a discrete-event simulator can occur only during a distinct unit of time during the simulation -- events are not permitted to occur in between time units. Discrete event simulation is generally more popular than continuous simulation because it is usually faster while also providing a reasonably accurate approximation of a system's behaviour.