Key bumping is a technique used to unlock doors by manipulating the pins inside a lock. This method involves using a specially cut key, known as a bump key, which is inserted into the lock and then struck with a tool to create a jarring effect. The impact causes the pins to jump, allowing the lock to turn and open. This technique is often associated with lock picking and is considered a form of unauthorized entry. While it can be used by locksmiths for legitimate purposes, it is also a method employed by burglars, making it important for homeowners to invest in high-security locks to prevent such break-ins.