Most door locks come in these four categories. The differences between them are easy to understand. A KEYLOCK has a key-operated lock on the exterior and a push button or turn lock on the interior. These are most often used on the entry doors of a residence. A PRIVACY door lock is often used for a bathroom door. It has a push button or turn lock on the interior. A PASSAGE door lock does not include a locking mechanism and is usually used for bedroom or other interior room doors. A DUMMY lock is simply a knob that does not have a latch or any other internal parts. Dummies do not turn are most often found on closet doors.
