NFC, or near-field communication, is a set of protocols that enables electronic devices to communicate.
This type of communication can occur over a distance of about four centimeters.
It offers a low-speed connection, which is sometimes used as a bootstrap for more capable wireless.
NFC technology can be used for various applications. It has three modes of operation: reader/writer mode.
In peer-to-peer mode, two devices exchange data in order to carry out a transaction.
In this mode, any device can be the initiator and the other can act as the receiver.
The active device can read the data stored on the NFC tag.
For example, a smartphone could serve as a keycard for an office building and open doors automatically.
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