Physical keys are tangible objects used to operate locks, providing security and access to buildings, vehicles, and safes. Typically made of metal, they come in various shapes and sizes, designed to fit specific locks. When inserted into a lock, the key's unique pattern aligns with the internal mechanisms, allowing the lock to turn and open. In addition to traditional keys, there are also specialized types, such as skeleton keys and master keys, which can open multiple locks. With advancements in technology, many people are now using smart keys or key fobs, which offer keyless entry and enhanced security features.