Simulator (noun)

A machine that imitates the conditions of a particular environment or system in order to train or test people or equipment.

Origin:

Early 17th century, from latin simulare "make like".

Examples:

1. The flight simulator is used to train pilots in realistic conditions.
2. The driving simulator helps new drivers get familiar with the road.
3. The medical simulator is used to train surgeons in performing procedures.
4. The virtual reality simulator lets you experience different scenarios.
5. The stock market simulator helps investors practice their trading skills.