The door closer is a device that closes a door in a controlled manner, generally preventing it from crashing after someone has opened it or opened it automatically. In this way, it minimizes the vulnerability of the door while leaving the space. In addition, since the door and door hardware are not exposed to hard bumps, they are protected and a comfortable opening and closing opportunity is provided. The force used to open the door is stored in a type of spring, and when released, this energy is used to return the door to the closed position. Door closers can also be connected to a building’s fire alarm system.