Door security

Door security is a way of making sure people can't get into a room without permission. It usually involves using locks, which are metal devices that prevent a door from being opened until they are unlocked with a special key. Some locks are very strong and can't be broken, while others are easier to pick or open with tools. Some doors also have deadbolts and other kinds of locks, which add extra protection to make it even harder to get in. If a door is opened without permission, an alarm may sound that can alert people to the possible intruder.