Usually by cutting off the air to the fire. They either blanket the fire under a layer of CO2 gas, or spray a powder that cuts off the air.
Correct as they may not displace enough O2 to put the fire out-causing it to reignite.
Extinguish means "put out", so a fire extinguisher puts out fire.
a fire extinguisher can put out a fire
It will put out burning fluids.
Fire extinguisher
Burning liquid fires require a U.L. Class B fire extinguisher, or ABC, or BC.
A shoe factory is likely to have Class B hazards requiring an ABC or BC type of fire extinguisher.
ABC, BC or C. It is often best to disconnect the electrical power and use an extinguisher appropriate for whatever type of fuel happens to be burning (A or B). Do NOT use a water-type A fire extinguisher on an energized electrical fire.
Get a fire extinguisher! Or get LOTS of water!
To put out a fire...
Put it out with a fire extinguisher.
Liquid