How NFC Tags Work
NFC tags are small chips that communicate with smartphones via radio frequency. When tapped, they trigger actions like opening URLs or apps.
Quick Answer
NFC (Near Field Communication) tags are passive chips that store small amounts of data and communicate via radio frequency when powered by a reader device (like a smartphone). The chip contains an antenna and memory (typically 48 bytes to 8KB). When a phone is held within 4cm, the phone's NFC reader powers the chip through electromagnetic induction, reads the stored data (usually a URL), and triggers an action. No batteries required in the tag — it's powered by the phone.
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