What are NFC tags and readers? How do they work? - Android Authority
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NFC tags allow you to quickly transfer small amounts of data with just a single tap. Here's how the tech works.
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What is NFC and how does it work? Here's everything you need to know
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Learn All About NFC Tags — A Beginner's Guide
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Android-er: Android NFC example, to read tag info of RFID key and card