A skeleton key is a type of key designed to open multiple locks, particularly those that have a simple mechanism. Unlike regular keys, which have unique cuts, skeleton keys have a minimalistic design that allows them to bypass the tumblers in certain locks. This makes them useful for locksmiths and in situations where access to multiple doors is needed. Historically, skeleton keys were commonly used in large buildings, such as castles or hotels, where a single key could grant access to many rooms. Today, they are less common due to advancements in lock technology, but they still hold a place in discussions about security and access control.