A door closer is a device that automatically closes a door after it has been opened. It helps ensure that doors are securely closed, preventing them from being left open accidentally. Door closers are commonly used on both interior and exterior doors in homes, offices, and public buildings. The device is usually mounted on the top of the door or its frame and works by using a spring or hydraulic mechanism to control the speed at which the door closes. This ensures the door closes smoothly and quietly. Some door closers also allow you to adjust the speed and force of the closing action, which is especially useful for heavy doors or doors in high-traffic areas. They are important for safety, energy efficiency, and security, as they help prevent drafts, keep rooms secure, and even reduce the risk of fire spreading in case of emergencies. Door closers are easy to install and maintain.