A garage door opener is an electric device that automatically opens and closes a garage door. It typically consists of a motor, a remote control, and a system of pulleys and tracks. When activated, the opener moves the door up or down, providing convenience and security for homeowners. Most garage door openers use either a chain drive, belt drive, or screw drive mechanism. Chain drives are durable and cost-effective, while belt drives operate more quietly. Screw drives require less maintenance but may be slower. Many modern openers also include safety features, such as automatic reversal if an object is detected in the door's path.