NFC Toolkit: What is NFC?

From Wikipedia:

Near field communication (NFC) is a set of standards for smartphones and similar devices to establish radio communication with each other by touching them together or bringing them into close proximity, usually no more than a few centimeters. Present and anticipated applications include contactless transactions, data exchange, and simplified setup of more complex communications such as Wi-Fi.

Communication is also possible between an NFC device and an unpowered NFC chip, called a 'tag'.

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