What engine is the air and fuel mixture ignited by heat created during compression stage rather than a spark plug?

The engine that ignites the air and fuel mixture by heat created during the compression stage rather than a spark plug is called a compression ignition engine, or more commonly, a diesel engine.

Here's why:

* Compression Ignition: In a diesel engine, the air is compressed to a very high pressure, raising its temperature significantly. This high temperature is enough to ignite the fuel that is injected into the combustion chamber at the end of the compression stroke.

* No Spark Plug: Diesel engines do not use spark plugs to ignite the fuel.

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