A deadbolt is a type of lock that provides extra security for doors. Unlike a standard spring bolt lock, which can be easily opened with a credit card or similar object, a deadbolt requires a key or a thumb turn to unlock. This makes it much harder for intruders to gain access to your home. Deadbolts are commonly used on exterior doors to enhance safety and peace of mind. There are different types of deadbolts, including single-cylinder and double-cylinder versions. A single-cylinder deadbolt has a keyhole on the outside and a thumb turn on the inside, while a double-cylinder deadbolt requires a key on both sides. Choosing the right deadbolt can significantly improve the security of your home.