It is a metallic container that contains an extinguishing agent, i.e. a liquid, solid or gaseous substance that, when in contact with a combustion material, extinguishes the fire. It is capable of fighting or extinguishing an incipient fire. When its valve is opened, the extinguishing agent exits through a hose that must be directed to the base of the fire.
A fire extinguisher also has a safety device that prevents accidental actuation. They should be placed visibly in educational institutions, workplaces, commercial premises such as restaurants and hotels, as well as in public or private offices.