Bump keys are specially crafted keys used to open locks without the original key. They are created by filing down the ridges of a key blank to create a smooth surface that can bypass the pins inside a lock, allowing it to be turned and opened.
Bump keys are often used by locksmiths and security professionals for legitimate purposes, such as unlocking doors in emergency situations or creating duplicate keys. However, they can also be used for nefarious purposes, such as burglary or unauthorized entry. The ease with which bump keys can be made and used has raised concerns about their potential misuse.