RFID (Radio Frequency Identification) and NFC (Near Field Communication) are technologies that are commonly used for identification and tracking purposes. These technologies use radio waves to communicate between a tag (or device) and a reader. They are often employed in applications such as access control, inventory management, contactless payment systems, and even smartphone interactions.

RFID typically uses longer-range communication (from a few centimeters to several meters), while NFC is a subset of RFID technology with much shorter range, typically within 10 cm.