A security bar on a door is a simple yet strong tool used to add extra protection to your home or office. It is usually placed between the door and the floor or wall to stop the door from being forced open, especially on hinged or sliding doors. Made from heavy-duty materials like steel or aluminum, security bars are easy to install and adjust. They work well as a backup to door locks and are a popular choice for people who want to feel safer at night or while away from home.