A door closer is an essential mechanical device that ensures doors close automatically after being opened. It plays a crucial role in maintaining security, conserving energy, and reducing noise levels. This device is commonly installed in commercial buildings, offices, residential properties, and public facilities to prevent doors from remaining open unnecessarily. Available in different types, such as overhead, surface-mounted, and concealed door closers, they provide convenience and controlled door movement. Many modern models come with adjustable speed settings, ensuring doors close smoothly without slamming, preventing damage to the frame and hinges.