A vacuum pump is the name given to a device that removes gas molecules from a closed unit in order to leave some of the vacuum behind. In summary, we can call motor vehicles to the question of where the vacuum pump is used. The vacuum pump is used to generate negative pressure or low pressure. It is also used in motor vehicles to perform some functions and to operate the systems smoothly. In some cases, a vacuum accumulator is also included if the vacuum needs to be stored. The vacuum pump is not only mechanical equipment but also electrical. A vacuum is a container in which the gas pressure is much less than atmospheric pressure. The force of the moving gas molecules hits the walls of the container and thus pressure builds. Inside the pump, a mechanism expands a small space in order to lower the pressure below the atmosphere. In this way, some liquid from the vacuum pump chamber is pushed into the small space of the pump.