Car keys are small devices used to start and operate vehicles. They typically consist of a metal blade that fits into the car's ignition and a plastic head that may contain buttons for locking and unlocking doors. Modern car keys often include electronic components, such as transponders, which enhance security by preventing unauthorized access. In addition to traditional keys, many vehicles now use key fobs, which allow drivers to unlock and start their cars without inserting a key. Some advanced systems even feature smartphone integration, enabling users to control their vehicles through apps. These innovations improve convenience and security for car owners.