Do all gas engine cars have spark plugs?

Here's why:

* Spark plugs ignite the fuel-air mixture: In a gasoline engine, the combustion process relies on a spark to ignite the fuel and air mixture inside the cylinders. This explosion drives the pistons and creates power.

* No spark, no combustion: Without spark plugs, the fuel wouldn't ignite, and the engine wouldn't run.

There are some other types of engines, like diesel engines, that don't use spark plugs. They rely on compression ignition instead. But for gasoline engines, spark plugs are essential.