A machine that converts energy into motion or mechanical work.

• A device producing power to drive mechanisms.

The power unit of a car or other vehicle.

• Usually an internal-combustion or electric motor.

A self-propelled railway vehicle that pulls or pushes trains.

• A locomotive.

A software or hardware core that performs a specific task.

• Used for search, graphics, or physics processing.

A person, factor, or institution that drives progress.

• The main force behind a process or change.