A fire department (North American English) or fire brigade (Commonwealth English), also known as a fire company, fire authority, fire district, fire and rescue, or fire service in some areas, is an organization that provides fire prevention and fire suppression services as well as other rescue services.

A fire extinguisher is an active fire protection device that is used to suppress or extinguish small fires.

A fire sprinkler system is an active fire protection method, consisting of a water supply system providing adequate pressure and flowrate to a water distribution piping system, to which fire sprinklers are connected.

Water is a transparent, odorless, tasteless liquid that covers around 71% of the Earth's surface and is the most abundant substance on the planet.