Key duplication is the process of creating a copy of a physical key. This is often done at hardware stores or locksmiths, where specialized machines cut a new key based on the original. Key duplication is commonly used for house keys, car keys, and other types of keys to ensure that multiple people can access the same lock. The accuracy of key duplication depends on the quality of the original key and the equipment used. Some modern keys, like those for cars, may have electronic components that require programming, making duplication more complex. In such cases, professional services are often needed to ensure proper functionality.