A hook latch is a simple mechanical device used to secure doors, gates, and cabinets. It consists of a hook-shaped metal piece that engages with a catch or strike plate, allowing the door to be held closed. When the hook is lifted, the door can be opened easily. These latches are commonly found in residential and commercial settings due to their ease of use and reliability. They can be made from various materials, including steel, brass, or plastic, and are often used in conjunction with other locking mechanisms for added security.