NFC stands for Near Field Communication. It's a way for your phone to interact with something in close proximity. It operates within a radius of about 4 cm and provides a wireless connection between your device and another.
RFID is the process by which items are uniquely identified using radio waves, and NFC is a specialized subset within the family of RFID technology. Specifically, NFC is a branch of High-Frequency (HF) RFID, and both operate at the 13.56 MHz frequency.
Runjob / Runasset also uses QR codes in conjunction with our NFC tags.