For Example your emulation of your older brother on the tennis court might create a rivalry between you as you before a better player. *The pilot learned how to react to a life threating loss of engine power by taking part in flight simulation traning

Emulation is when you are replicating, in a different system, how the original system actually internally works considering each function and their relations. Simulation is when you are replicating by the means software, the general behavior of a system starting from a conventional model. The difference between valaidation and verification is the process of checking whether the specification captures the customers needs, while verification is the process of checking that the software needs the specification. Certification is refers to the confirmation of certain characteristics of an object, person or organization.