RFID (Radio Frequency Identification) is a technology that uses radio waves to identify objects and people. It is used in a variety of applications, such as tracking inventory, monitoring access to restricted areas, and tracking the movement of people and goods. RFID tags are small devices that contain a chip and an antenna, and can be attached to objects or embedded in them. When an RFID reader is used to scan the tag, the chip sends a signal to the reader, which can then be used to identify the object or person.