NFC – or Near Field Communication –NFC cards have become commonplace over the last few years. NFC technology is widely in use on public transport networks (like London’s Oyster or Hong Kong’s Octopus) and also now integrated into credit and debit cards to enable small purchases to be made with just a tap.

But how does the nfc card work? Here’s a quick explanation.

NFC is an evolution of radio frequency identification (RFID) technology – the technology used in everything from 13.56Mhz anti-theft tags in shops to the chips that track our pets.

NFC chips can store data – such as how much funds are left on your travel card – which is then read by an NFC reader using electromagnetic radio fields. These fields allow communication over a short range, generally no more than a few centimeters. The NFC chips now common in transport or travel cards can be activated by an NFC reader, such as those you see at retail checkouts or in the entrances to public transport networks.

To make sure data is secure, NFC connections are established over a secure channel that encrypts the data as it passes from card to reader. You can read more about how contactless payments are secured here.

NFC technology has many uses beyond cards, from being integrated directly into mobile phones to enable mobile payments, to smart toys that unlock bonus content in videogames.

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