A zár is a device used to secure doors, cabinets, and other objects, preventing unauthorized access. They come in various types, including mechanical locks, electronic locks, and smart locks, each designed to provide different levels of security. The main components of a zár typically include a key or code mechanism, a bolt or latch, and a housing. When the correct key or code is used, the mechanism allows the bolt to move, either locking or unlocking the door. Proper installation and maintenance are essential for ensuring the effectiveness of a zár.