Some types of deadbolt locks include single- and double-cylinder locks. Another type of deadbolt has a physical keypad, while some have digital keypads. A rim deadbolt is a type of lock that always locks when a person closes the door.
The single-cylinder deadbolt is the most common type. It features a key cylinder on the exterior to allow the homeowner to enter, while the back of the knob features a twisting lock. A double-cylinder deadbolt is similar to a single, except both sides feature key slots. On a keypad deadbolt lock, the homeowner simply enters in a password to enter the house. A digital keypad is the same, but it requires batteries or another power source to operate.