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What's a deadbolt lock?
These are often used as an additional layer of security, in combination with a knob lock or a lever-style lock. It’s rare these are accidently locked, as they generally need to be locked from the outside.
In terms of additional security, they play two parts – one is that they provide another anchor point for the door into the door jamb, making the door harder to kick in or out.
The second is that it doubles the amount of effort involved in bypassing a door any other way.
A single cylinder deadbolt will have a key hole on one side and a thumb turn on the other, a double will have a key turn on both sides.