The results of a simulation, typically numerical outputs, can be displayed graphically or animated. The effects are demonstrated very clearly. Simulation can show effects that a real prototype does not. For example, a simulation can illustrate the near-fracture point of a model whereas in a real physical testing a prototype may not yet have failed. Simulation allows multiple trials of physical testing without actually building numerous physical prototypes.
Virtual testing reduces time, labor and material costs.
It saves time. You can also save mone by avoiding additional material or labor costs.