In this project an automatic door unlocking system typically uses various technologies to open doors without the need for manual intervention. These systems are commonly used for security, convenience, and efficiency, and can be designed for both residential and commercial applications. There are different types of automatic door unlocking systems, each utilizing various mechanisms for unlocking. An automatic door unlocking system typically works through a combination of sensors, using RFID and Ardiuno. In summary, an automatic door unlocking system uses a combination of wireless communication, sensor detection, and electronic locking mechanisms to unlock a door automatically when the correct credentials are presented.