Fire hydrant pump systems (also known as fire pumps, hydrant boosters, firewater pumps) are high pressure water pumps designed to increase the fire fighting capacity of a building by boosting the pressure in the hydrant service when mains is not enough, or when tank fed.

Putting it another way, a fire hydrant system is a water supply with a sufficient pressure and flow delivered through pipes throughout a building to strategically located network of valves for fire-fighting purposes

A fire hydrant is a visible fixture placed inside or outside a building, parking area, industrial area, mine, roadside, etc. that is connected to the municipal or a private water service network. Fire hydrants are designed to instantly provide the water required by fire fighters to extinguish a fire.

In most cases, a fire hydrant is the primary method of firefighting in a municipal area. It is basically an outlet with a valve that provides water to the fire pumps or fire jeeps engaged in firefighting. Laws for keeping operational fire hydrants at specific intervals and with free access in buildings, factories, urban and developed areas are an important component of fire control and safety.