Direct Answer First: An NFC (Near Field Communication) tag is a passive, programmable chip that stores small amounts of data and triggers automated actions when touched by an NFC-enabled device (like a smartphone). Operating at 13.56 MHz, these tags have a short range (<10cm) but offer high security and zero power consumption. In 2026, they have become essential for smart home automation, digital business cards, and product authentication.

NFC tags operate through Inductive Coupling. When an NFC reader (your phone) comes close to a tag, it creates a small electromagnetic field that powers the tag's internal chip. This allows the tag to send its stored information back to the phone.
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