A door holder is a simple device used to keep a door open. It can be a physical object, like a wedge or a spring-loaded mechanism, that prevents the door from closing. Door holders are commonly used in homes, offices, and public spaces to allow easy passage and improve ventilation. There are various types of door holders, including rubber door stops, magnetic door holders, and hook-and-eye latches. Each type serves the same purpose but operates differently. For example, a magnetic door holder uses magnets to hold the door open, while a rubber door stop is placed on the floor to block the door.