A door securer is a device used to secure a door from being opened without permission. The most common door securers are a LATCH, HASP, BOLT, and LOCK. A LATCH is a type of fastener that is used to hold a door closed. A HASP is a metal loop with a hinged arm that is used to secure a door or lid. A BOLT is a metal bar that slides into a bracket to secure a door. Lastly, a LOCK is a device that is used to secure a door by using a key or combination.