A door closer is a mechanical device installed on doors to automatically close them after they have been opened. It’s commonly used for safety, convenience, and energy efficiency. Here’s a breakdown of what it does and how it works: Security & Safety: Ensures that doors close properly, which can be important in maintaining fire safety or keeping an area secure. Energy Efficiency: Helps maintain climate control by ensuring that doors close tightly, preventing drafts. Noise Reduction: By controlling the speed and force with which a door closes, it can minimize the noise caused by slamming.