what are QR codes and how does my phone camera associate them with a link or URL
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Oversimplified: a QR code is really just a compact and complicated font. The different patterns of squares make no sense to us, but the font can be read by our phones. So when your phone associates them with a link, it’s a font that says www.[whateverrandomwebsite].com. For convenience, your phone sees that website and offers to take you there.
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