Do you know how binary works? A bunch of 1’s and 0’s, which your phone/computer interprets into various kinds of data?
A QR code is binary in the form of squares that are either black or white. There’s some guidelines to let the computer know where to start reading, what format the data is supposed to be, and some things that make it easier for a camera to get the exact interpretation, but that’s what it is at it’s most basic.
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