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. They are often used in older types of locks, such as those found in antique furniture or historical buildings. These keys are sometimes referred to as master keys because they can unlock various doors within a specific system. While skeleton keys are less common today due to advancements in lock technology, they remain a fascinating part of locksmithing history and are often collected by enthusiasts.