A door latch is a mechanical device used to secure a door in a closed position. It typically consists of a metal bolt that slides into a strike plate on the door frame, preventing the door from being opened without a key or handle. Door latches come in various types, including deadbolts, spring latches, and slide bolts, each serving different security needs. In addition to security, door latches also provide convenience. They can be operated with a simple turn of a knob or lever, allowing easy access while still keeping the door closed. Proper installation and maintenance of door latches are essential for ensuring their effectiveness and longevity.