Smart keys are advanced electronic devices that allow users to unlock and start their vehicles without using a traditional key. They typically use radio frequency identification (RFID) technology to communicate with the car, enabling keyless entry and ignition. This convenience enhances security, as smart keys are harder to duplicate than standard keys. In addition to unlocking doors, smart keys often come with features like remote start, trunk release, and even personalized settings for different drivers. Many modern vehicles from manufacturers like Toyota, Ford, and BMW now include smart key systems, making them a popular choice for car buyers.