What is NFC?
Near-field communication (NFC) is the exchange of information between a passive NFC chip (NFC tag) and an NFC reader pre-installed on a smartphone. The stored function is triggered when the chip is activated at close range by placing the smartphone over it. This gesture is called tapping.
How does NFC work?
NFC works on the basis of electromagnetic induction. At 424 kB/s, the transmission speed is lower than that of Bluetooth and is only sufficient to send very small amounts of data or for verification purposes. Complex functions, e.g. the sending of high-quality content, services or interactions that are triggered are defined beforehand in a cloud.
Proximity marketing with NFC
Typical everyday uses of NFC include mobile or contactless payment, ticketing, industrial applications and – in smart homes – the control of household appliances. NFC chips are also used in sportswear.
Tips for implementing NFC tags can be found here: https://www.wingu.de/wie-funktioniert-nfc.