system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] Why does water extinguish the fire ?


It's in the title.
gpt
there's 3 key elements to a Fire: 1) Heat, 2) Fuel, 3) Oxygen.  The Fire Triangle.

Water is great at cooling down the fire and then turned into steam/smoke (surface cooling).  The steam/smoke acts as a blanket to smother the fire (smoke cooling).  With less heat, wet fuel and less oxygen the fire will most likely extinguish with enough water.

however, you shouldn't put out all fires with Water.  IIRC, kitchen grease fires should be put out by Milk/Salt/Baking Soda/etc.