A laser igniter is a device that starts a fire using a laser instead of a spark or match

The laser shoots a very focused beam of light at fuel (like gas mixed with air). That light is so intense it heats the spot instantly or makes a tiny flash of energy, and *the fuel ignites*

In short:
Light starts the fire, not a spark.

They’re mainly used in things like jet engines, rockets, and labs because check here they’re precise and don’t wear out like spark plugs.

If you want it even simpler or with a real-world analogy (like a magnifying glass and sunlight), say the word.